Product Description 【Door chimes when door opens】This wireless door chime can be a good reminder for you if you have toddler who try to sneak out of their bed room or help alert you the elderly with dementia who is trying to get out of the house. : This door entry chime can be used as a doorbell for your retail shop for your commercial to remind you when someone walks into your store, you will never miss any customers(visitors) 【Easy to Install】The door sensor chime and receiver are paired already,Just plug the receiver into standard outlet, tear the double-side adhesive tape of the entry alert chime and stick them to any door or window. [55 Music with Mute to 110dB]: The door chime for business/home has 55 chimes with 5 adjustable volumes. With LED indicators and memory function: Keep the previous set tune after re-plugging it 【Long Range & Expandable】The door chime wireless door sensor has 500feets far enough to cover every door in your house or store. And each door opening chime for business can be paired unlimited magnetic sensor, you can also pair different ringtone to each sensor, so that you can realize exactly which door is triggered Door Sensor Chime Installation method and pairing method Expert sharing vedio   How do i change the sound? Arrow buttons to select your favorite sound, then press and hold the middle SET button for 6-8 seconds, near door magnet, after the didi sound will be paired with the door magnet successfully.Repeat the above steps for different door magnet pairings. Does light stay on while door remains open, or just while unit is chiming? The light stays on just while the unit is chiming. It chimes twice when the door opens and stops even if the door stays open. Can you set different chimes for different sensors?          Yes, you can set different chimes for each sensor to know which door is open. Technical Details Color ‎Black Power Source ‎Corded Electric Compatible Devices ‎Smartphone, Tablet Connectivity Technology ‎Wireless Installation Type ‎wireless DIY Alert Type ‎Entry Voltage ‎120 Volts (AC) Control Method ‎Touch Battery Cell Composition ‎Alkaline Maximum Range 500ft Battery Life ‎1 years Noise Level ‎110 dB Sensor Technology ‎Contact Sensor Batteries ‎2 12V batteries required. (included) Size ‎2 Sensors + 1 Receiver Black Material ‎ABS Shape ‎Rectangular Wattage ‎1 watts Special Features ‎Easy to Install Usage ‎door chimes when door opens for home door chimes when door opens for business Batteries Included? ‎Yes Batteries Required? ‎Yes Description Pile ‎12V

【Easy to Install】The sensor and receiver are paired already,Just plug the receiver into standard outlet, tear the double-side adhesive tape of the door / window sensor and stick them to any door or window. 【Long Range & Expandable】The door chime wireless door sensor has 1000feets far enough to cover every door in your house or store. And each door opening chime for business can be paired unlimited magnetic sensor, you can also pair different ringtone to each sensor, so that you can realize exactly which door is triggered 【Monitor Your house with Wireless Door Chime】This entry alert chime can be a good reminder for you if you have toddler who try to sneak out of their bed room or help alert you the elderly with dementia who is trying to get out of the house. 【Keep Your Home Security 】This door sensor chime for business when burglar opens door and helps deter break-ins(business door chime activates when magnetic sensor separates) 【Mute To 120 DB Loud Soud 】This door alarm with chime has 5 adjustable volume from 0-110 dB silent mode, 0dB won't disturb a sleeping baby. Memory function: Keep the previous setted tune after re-plugging it Product Description Perfect for a big house 1000ft Wide Wireless Range Make sure you hear the ringtones even from the back door CallToU Wireless Door Chime for Business/Home Long Range & Expandable The door chime sensor has 1000ft far enough to cover every door in your house or store. And each door chime for business can be paired unlimited magnetic sensor, you can also pair different ringtone to each sensor, so that you can realize exactly which door is triggered   Door chimes when door opens for home Door open alarm will alert you when old dementia patients/alzheimers patients is trying to get out of the house or alarm you know your little toddler who trying to sneaking out from bedroom or sleepwalking . Door announcer- keeping the track on your loved one.   Door chimes when door opens for home   Door open alarm will alert you when old dementia patients/alzheimers patients is trying to get out of the house or alarm you know your little toddler who trying to sneaking out from bedroom or sleepwalking . Door announcer- keeping the track on your loved one. Office door chime The door buzzer entry system has 5 volume and 55 song（15 short ringtones and 40 long ringtones） ,it will alarm when someone comes and goes from your office’s front door.(door buzzer can be programed each for a different tune so you can know which door opens) Whether you are pairing multiple sensors or want to change your music, you only need to re-pair once.   How to change the batteries & Packages 1.Gently move the cover of magnetic door sensor 2. Remove the battery out to replace a new one.   Installed on almost all doors It can be installed on doors, glass doors, sliding doors, Windows, refrigerators, cabinets and other places. Technical Details Color ‎3 Sensors + 1 Receiver Power Source ‎Sensor: Battery-Powered; Receiver: AC Item Dimensions LxWxH ‎4.72 x 3.54 x 4.13 inches Connectivity Technology ‎Wireless Installation Method ‎Self-Adhesive Item Weight ‎0.25 Kilograms Voltage ‎110 Volts Battery Cell Composition ‎Alkaline Battery Life ‎2 years Sound Level ‎110 dB Item Weight ‎8.8 ounces Product Dimensions ‎4.72 x 3.54 x 4.13 inches Country of Origin ‎China Item model number ‎MC01BL 3-1 Batteries ‎3 12V batteries required. (included) Is Discontinued By Manufacturer ‎No Material ‎ABS Shape ‎Square Mounting Type ‎Protruding Plug Format ‎A- US style Usage ‎Commercial/Residential/ Indoor Batteries Included? ‎Yes Batteries Required? ‎Yes  

Product Description 【Product up-gradation】The upgraded door sensor chime can make each battery use 100,000 times, easy to use 3-5 years, you no longer have to frequently replace the battery【Door chimes when door opens】This wireless door chime can be a good reminder for you if you have toddler who try to sneak out of their bed room or help alert you the elderly with dementia who is trying to get out of the house.【Wide Working Range】:This wireless door open chime for home is up to 600 ft in open area,The 55 ringtone options match different ringtones to different doors so you know which one opens【Mute to 110dB】 5 adjustable volume levels. The max volume 110dB is loud enough to be heard anywhere in the house even basement, you will never miss out an alert. Prefer not to be disturbed? Set it to mute.50 Sensor Expandable: The receiver can be paired up to 50 chime sensors/the door sensor can be paired up to 50 receivers. Can be used to install in your dining room, bedroom, living room, garage, yard, or your store and office. Door Sensor Chime Installation method and pairing method Expert sharing vedio How do i change the sound? Arrow buttons to select your favorite sound, then press and hold the middle SET button for 6-8 seconds, near door magnet, after the didi sound will be paired with the door magnet successfully.Repeat the above steps for different door magnet pairings. Does light stay on while door remains open, or just while unit is chiming? The light stays on just while the unit is chiming. It chimes twice when the door opens and stops even if the door stays open. Can you set different chimes for different sensors? Yes, you can set different chimes for each sensor to know which door is open. Technical Details Color ‎Black Power Source ‎Corded Electric Compatible Devices ‎Smartphone, Tablet Connectivity Technology ‎Wireless Installation Type ‎wireless DIY Alert Type ‎Entry Voltage ‎120 Volts (AC) Control Method ‎Touch Battery Cell Composition ‎Alkaline Maximum Range 500ft Battery Life ‎1 years Noise Level ‎110 dB Sensor Technology ‎Contact Sensor Batteries ‎2 12V batteries required. (included) Size ‎2 Sensors + 1 Receiver Black Material ‎ABS Shape ‎Rectangular Wattage ‎1 watts Special Features ‎Easy to Install Usage ‎door chimes when door opens for home door chimes when door opens for business Batteries Included? ‎Yes Batteries Required? ‎Yes Description Pile ‎12V

Product Description This WiFi emergency alarm device can be connected to your cell phone for remote push to take care of the old and young at home anytime and anywhere. When the elderly or children open the door to go out, the hub will sound an alarm, at the same time, the smartphone APP will receive a warning alert, no matter the phone is in another city or province, you can receive a instant warning alert anywhere. [ Door Alarms for Home Security ] With a reliable long range of 500 feet, this wireless door chime is suitable for home, business, store and other scenarios. If you have children, pets or demented elderly who like to go out, you will receive an alert immediately and you can use this door sensor alarm to keep your family safe. [ Peace of Mind for the Hearing Impaired ] With built-in LED indicators, the wireless door alarm receiver and sensors provide extra help for the hearing impaired when used in conjunction with the receiver, making their lives easier and giving their families peace of mind. [ Share Function & Expandable] You can set the sharing function of the tuya app so that when door or window opens, everyone you share it with can receive the alert message; besides thisWIFIcall system is expandable, you can add more hubs, or door sensors to meet the needs of various different usage scenarios. [ Service guarantee] Amazon Logistics is our partner, we can deliver the package to your home within 1-2 days, we provide 30 days return service, our product manual has detailed operation instructions to help you better use our products.        Wireless Door Chime Window and Door Alarms for Home     Door Chimes When Door Opens for Home NOTE: 1.Only supports 2.4G network, and does not support 5G network!! 2.When pairing door sensor, pay attention to the orientation of the accessories, the side with the triangular pattern should be close together.After the correct direction, when you move the door sensor will only respond. WiFi By Sensor Window Alarm Sensors If you experience problems with the product not connecting or other problems, we will try our best to solve the problem for you. WiFi Door Sensor Window Alarm Sensors Product information Package Dimensions 5.39 x 4.69 x 2.36 inches Item Weight 9.9 ounces Batteries 2 12V batteries required. (included) Date First Available March 21, 2023     CallToU Product-Caregiver Pager & Door Alarm   WiFi Caregiver Pager WIFI Rechargable Pager Color White Black White Range Button and Hub:1000Ft/300m Button and Hub:1000Ft/300m Feature WIFI WIFI, Battery Charging Ringtone Ringtone Phone Alert Ringtone Phone Alert How to use Plug to use After Charged/Plug to use

Product Description Q1: How portable is the CallToU Door Chime Receiver? A1: The CallToU Door Chime Receiver is incredibly portable, with an ultra-compact design that's 1/3 the size of an iPhone. With a working range of over 500 feet, you can easily move it to your bedroom, kitchen, or yard, ensuring you never miss an alert. Q2: Can I customize the alert settings on the door sensor chime? A2: Yes, the door sensor chime offers 2 different chime options and 5 volume levels, each with a strong vibration. If you prefer not to be disturbed by noise, you can set it to Mute + Vibrate, creating a comfortable and safe environment in your home or business. Q3: How does the CallToU Door Alarm help in monitoring multiple entry points? A3: The CallToU Door Alarm system is designed with numbers 1-20 on the receiver. When a door or window is opened, a ringing tone and digital display show the corresponding number, helping you instantly identify which entry point was accessed, enhancing your home security or business monitoring. Q4: Is there a low battery alert for the CallToU door sensors and receiver? A4: Yes, the CallToU Door Alarm system includes a low battery alert function. This feature ensures you are always aware when it's time to replace batteries, maintaining the reliability of your security system. Q5: What makes CallToU door alarms a reliable choice for home security and business use? A5: CallToU specializes in designing and manufacturing durable and effective security products, trusted by over 1 million families. Our door alarms are built to last, offering a reliable and cost-effective solution for preventing unauthorized access, monitoring visitors, and ensuring the safety of your loved ones or business premises.                 Technical Details Manufacturer ‎CallToU Batteries ‎AAA batteries required. (included) Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline

Product Description Why Choose CallTou? Complete Protection with No Hidden Fees Our system includes everything you need to secure your home: 1 Alarm Siren Station 5 Window & Door Sensors 2 Remote Controls With no contracts and no subscription fees, you get complete protection without any hidden costs. Silent and Efficient Monitoring Unlike traditional alarm systems, CALLTOU's smart door sensors send alerts directly to the alarm station without making any noise. This means no false alarms and no disturbing noises at night. Keep track of activities in your home or business and ensure the safety of your children and elderly loved ones without any annoying interruptions. Easy Customization Our security system supports up to 200 sensors or key fobs, allowing you to customize your setup according to your needs. Add extra sensors and key fobs to different rooms and expand your system effortlessly. Hassle-Free DIY Installation Setting up your CALLTOU Wireless Home Security System is a breeze. You can install it within minutes without the need for any tools. The wireless connection ensures that your walls remain undamaged, and the alarm station connects directly to an AC adapter for continuous power. In case of power outages, the backup battery will keep your system running for up to 4 hours. Adjustable Volume for Peaceful Nights Our door alarm with chime offers four adjustable volume levels, from 0 to 90 dB. The silent mode ensures that sleeping babies and other family members are not disturbed. Please note that the receiver supports 2.4GHz WiFi only and does not support 5GHz.       Instant Notification Trigger event produce loud alarm at base unit as well as instant notification on phone. Access sharing You can share app with roommates to control your alarm system by adding their mobile phone number or email address. Easy to Install Clean your window/door surfaces good before installing. Put batteries on sensors. Just peel and paste ( double-sided sticky pads included). No Monthly Fee No monthly subscription. House or Apartment   Garage   Shed   RV Technical Details Brand ‎CALLTOU Color ‎White Power Source ‎Battery Powered Compatible Devices ‎Smartphone Item dimensions L x W x H ‎5.9 x 3.3 x 5 inches Connectivity Technology ‎Wireless Installation Type ‎Plug In Alert Type ‎Motion Battery Cell Composition ‎Alkaline Recommended Uses For Product ‎Home Security, Baby Monitor Included Components ‎Charger Item Weight ‎13.7 ounces Product Dimensions ‎5.9 x 3.3 x 5 inches Country of Origin ‎China Item model number ‎TY07-2-US Size ‎1 Sensor+5 Receivers Batteries Included? ‎Yes Batteries Required? ‎Yes

Product Description More Than Just Door Alarms: Our system offers more than just basic door alarms. By installing sensors on doors or windows, you can monitor the safety of children who are just starting to explore their independence or protect Alzheimer's patients from unsafe door openings. With Tuya App compatibility, you'll receive alerts on your phone and through the receiver simultaneously, providing double layers of protection for your home. Works with Tuya: Seamlessly connect your Smart WiFi Wireless Caregiver Pager Door Alarms to the Tuya App via a 2.4 GHz Wi-Fi network (please note that it's not compatible with 5 GHz). Once connected, you can control the chime remotely from your smartphone. Share access with your family so they can also monitor the alarms, no matter where they are, even if they're in a different city. Adjustable Alarm Volume: Our wireless door alarm receiver offers an adjustable alarm volume ranging from 0 to 110dB, with 5 distinct levels, including a mute option. You can select from 38 different chime sounds to suit your preferences. Additionally, the flashing indicator light ensures that the alarms are easily noticeable, making them suitable for individuals with hearing impairments. Easy Installation & Extended Range: Setting up your Smart WiFi Wireless Caregiver Pager Door Alarms is a breeze. The sensors and receiver come pre-paired, simply plug the transmitter into a standard outlet, choose your preferred chime, and you're ready to go. With a remarkable 500 ft working range, this system covers most homes. The sensors boast long-lasting battery life, minimizing the need for frequent replacements.       Share the door magnet information to other family members through Tuya APP, no matter where the family members are, they will receive the message alert immediately at the same time, which can take better care of the elderly and small children. Product information Product Dimensions 1.9 x 1.5 x 1.9 inches Item Weight 6.2 ounces（2 Sensors 1 Receiver） 8.1 ounces（3 Sensors 1 Receiver） Manufacturer CallTou Country of Origin China Item model number TY02-DS16 Batteries 3 12V batteries required. (included)

Product Description The door chimes when door opens for home and for business has 1000FT reliable long working range. Perfect entry alert chime when door opens for home and business. What about insecure front door, child safety gate, upstairs window, cabinet, basement door [ Easy to Install] This waterproof wireless door sensor chime are paired already, all you need to do is attach the transmitter on your door or window. The receiver is portable battery powered. LED indicators are suitable for the elderly who are hearing impaired [4 Remind Mode ] Door entry chime's receiver is with 4 remind modes, includes deaf doorbell flashing light has: 1,ringing + vibration 2,ringing + flashing light 3,ringing + vibration + flashing light 4,flashing light four modes to choose, flashing light silent mode, do not worry about the ringing will disturb the sleeping baby. LED light flashing, ringing vibration, you will never miss any visitors, in different scenes can choose different modes [ Smart Door Chimes] The receiver of door open chimes is equipped with 20 kinds of ringtones for your choices. 5 levels adjustable volume, from silent to noisy(0 db to110 db), and door sensor chime are wireless long-range operating up to 1000 feet(no blocking), you don't have to worry about not hearing the sound [After-sales Service ] The entry alert chime is can be a gift for relatives and friends to used to remind visitors, family anti-theft,etc. It has a 1-year warranty and please just feel free to contact us User Manual Long Working Range 1000FT Long Working Range 1000FT and 5 Volume level How to replace the battery？ Step 1: Use a small screw to align the hole below the door magnet and pry it open Step 2: Open the back cover and take out the battery for replacement 4 Remind Mode As a Christmas Gift Technical Details Manufacturer ‎CallToU Item Weight ‎8.1 ounces Package Dimensions ‎3.78 x 3.46 x 2.91 inches Batteries ‎2 AAA batteries required. (included) Batteries Included? ‎Yes Batteries Required? ‎No

Effortless Installation Pairing the sensor and receiver is a breeze, already done for your convenience. Simply insert the receiver into a standard outlet, then smoothly affix the door/window sensor with the provided double-sided adhesive to any entryway. Expansive Reach & Customization With a remarkable 1000-feet range, our wireless door sensor covers every nook of your dwelling or establishment. Each business door chime can effortlessly sync with an infinite number of magnetic sensors. Plus, tailor distinct ringtones to individual sensors for precise door identification. Smart Home Monitoring Stay ahead of the game with our Wireless Door Chime's entry alert system. Whether you're keeping tabs on a curious toddler sneaking out of their room or ensuring the safety of elderly loved ones with dementia, this device serves as a reliable reminder. Enhanced Home Security Our door sensor chime stands guard against intruders. When a burglar attempts entry, the business door chime leaps into action, deterring break-ins with its responsive magnetic sensor separation. Versatile Sound Control From a whisper-quiet 0 dB to a robust 120 dB, the door alarm with chime boasts 5 adjustable volume settings. Even at 0 dB, it won't disturb a sleeping baby. What's more? Its memory function retains your preferred tune after every re-plug, ensuring continuity of your chosen settings.   Technical Details Item Weight ‎8.4 ounces Product Dimensions ‎4.72 x 3.54 x 4.13 inches Item model number ‎DS10BL 3-1 Is Discontinued By Manufacturer ‎No Color ‎1 receiver 3 sensors Material ‎ABS Shape ‎Ellipse Power Source ‎battery powered, dc Voltage ‎110 Volts Installation Method ‎Screw-In & Self-Adhesive Item Package Quantity ‎1 Temperature Range ‎-22~158 Degrees Fahrenheit Sound Level ‎110 dB Type of Bulb ‎LED Plug Format ‎A- US style Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline Description Pile ‎‎23A 12V

Product Description 🌐Smart WiFi Door Sensor with APP Alerts: Control with the "Tuya Smart" or "Smart Life" app. Get instant app free notification alerts on your smartphone when doors or windows open or close. Please choose 2.4GHz WiFi, not support 5G WiFi. App notifications are free, if you choose SMS or phone notifications may need to pay. 🗣️Supports Voice Control: Door alarms for home compatible with Amazon Alexa and Google Assistant. Simply ask, "Alexa, is the 'Device Name' Closed/Opened?" If you face any connectivity issues, reach out to us for a quick solution. 🔊90dB Sound or Silence: With a double-click, adjust the volume of the 90dB door sensor chime to your liking, or simply turn off the sound altogether. You'll still receive alerts from the app regardless, making this wireless door alarm the perfect balance of convenience and customization. 🔋Batteries Included: The sensor door alarms are equipped with 2 AAA Batteries. Enjoy over one year of battery life with this door alarm sensor, avoids frequent replacement. 🔧Easy Installation and Widely Use: Install the door sensor with the included 3M sticker for a firm and durable hold. Place it on gates, refrigerators, drawers, bedrooms, garages, yards, pet doors, and more. You can refer to the video installation in the main image. 🤝Lifetime Warranty Service: No matter how long you have purchased, please feel free to contact us if you encounter any problems, and we will solve them for you within 24 hours. WIFI Smart Window/Garage/Door Alarm Sensors for Security When you leave home, it will push notification to you if the doors or windows are opened or invaded by an external object, you will find anomalies in your home immediately. Wifi detector door window Sensor can inform your whe record door and window Openning/Closing status in App. Door Sensor Alarms Detector Real Time You can ask your voice assistant the status of the doors, such as "Alexa, is the front door closed?" or "Hey Google, is the garage door open?" This provides a hands-free and convenient way to monitor and manage the doors in a home.   Control your home from anywhere Door Alarms for Home Security with App Get real-time mobile notifications and stay connected to your home's security. Put complete control in your hands with app whether you're at home, at work,or on a vacation. Smart Life or Tuya App notifications are free, but if you want text or phone notifications maybe need to pay. Please Note: If you unable connect this door sensor alarm with your Alexa device, It is probable that the virtual ID of TUYA not been activated, just need send us the virtual ID and we will solve this problem for you. Door alarms for safety Perfect for homes with toddlers, elderly, or individuals with Alzheimer's or dementia, this door sensor alarm will alert you whenever a door or window is opened, ensuring the safety of your loved ones. Pool door alarm With its WiFi and Bluetooth capabilities, you can easily connect it to your phone or receiver, and receive notifications wherever you are. Its portable and easy-to-install design makes it a versatile tool for your home, pool, patio, bedroom, freezer, or even off-site locations. Steps to add door alarm to the APP Equip it to automatically trigger the door alert alarm/chime, once someone opens your pool/Garage/ Window/ Drawer/door, and other personal home safety lines. Technical Details Batteries ‎2 AAA batteries required. (included) Color ‎3PALCK Power Source ‎Battery Powered Voltage ‎3 Volts (DC) Installation Method ‎Self-Adhesive Item Package Quantity ‎1 Sound Level ‎90 dB Included Components ‎alarm Batteries Included? ‎Yes

Product Description Key Features and Benefits Maximizing Safety Immediate Alerts: The door chime receiver alarms immediately when the magnetic door sensor separates by 1.5 cm, ensuring you are promptly notified if your loved ones open a door or window. Peace of Mind: Alleviates the stress and unpredictability associated with wandering, providing significant peace of mind for caregivers and family members. Multiple Chimes and Adjustable Volume Customization: The plug-in receiver offers up to 55 chimes, while the portable receiver has 5 chimes, allowing you to choose the sound that best suits your environment. Volume Control: Adjustable volume range from 0-110db helps prevent the chime sound from startling seniors who may already feel confused, ensuring a calm environment. Ultra Long Wireless Range Extended Coverage: The wander alert door alarm for dementia patients offers an impressive detection range of up to 1000 feet (500*2 feet), providing coverage for every window and door in your house. Reliability: The wireless motion sensor door chime ensures you can be there when your loved one needs you, instead of constantly watching over them. Upgraded Battery Life Durability: Designed for longevity, the Portable Caregiver Pager boasts a battery life of up to 107160 uses, making it a reliable tool for everyday safety. Aesthetic Design: Fits seamlessly into all types of homes and is also suitable for offices, stores, and more. Easy Installation and Use Pre-Paired Receivers: The door chime has been paired before delivery, making it ready to use immediately. No need for electrician installation. User Manual and Support: Includes a comprehensive user manual, 24-hour customer service, and a professional technology team ready to assist with any questions or issues. CallTou Wireless Caregiver Pager Door Alarms for Dementia Patients   Older adults living with Alzheimer’s disease or another form of dementia may experience feelings of confusion or disorientation that can cause them to wander away from their home or caregiver in search of something familiar. If you’re caring for a loved one with dementia who wanders or tries to leave the house, a dementia door alarm is an excellent option to keep them safe.     Plug-in Receiver 55 Ringtone 500 ft Working Range 5 Adjustable Volume Memory Function Expand pairing with multiple receivers   Potable Receiver - Battery 5 Ringtone 500 ft Working Range 5 Adjustable Volume Memory Function Expand pairing with multiple receivers   PROTECT YOUR KIDS AND FAMILY SAFETY Rest easy with CallToU alarms, whether you’re looking to provide extra security for your children or elders or trying to keep your house and pool safe these alarms provide a subtle and easy attachment for that extra security you’re looking for. INSTALLATION INSTRUCTIONS Does a sensor ring both receivers? Dear, it is absolutely possible! You just need to pair both sensors with the same receiver, and you can also use different ringtones to distinguish the front door or the back door.   How long do the sensor batteries last? It depends on how often you use it. According to data it can be used 107,160 times   What type of batteries do they use? The sensor comes with a CR2032 lithium battery. Portable receivers are alkaline AAA batteries.   Does the door have to be shut totally tight for this to work? No. The sensing distance of the AB part of the door magnetic sensor is 0-1cm. When installing, align the arrows on both ends.   Can I use 1 Sensor for 2 Receivers? Yes. Technical Details Brand ‎CallToU Color ‎Black Power Source ‎Battery Powered Connectivity Technology ‎Wireless Installation Type ‎Self-Adhesive Alert Type ‎Motion Battery Cell Composition ‎Alkaline Included Components ‎Battery Noise Level ‎110 dB Battery Cell Type ‎Alkaline Manufacturer ‎CallTou Item Weight ‎‎9.2 ounces/10.9 ounces Package Dimensions ‎‎4.61 x 3.7 x 3.58 inches/4.88 x 4.13 x 3.54 inches Sensor Batteries ‎1 CR2 batteries required. (included) Batteries ‎3 AAA batteries required. (Socket+ battery included) Batteries Included? ‎Yes Batteries Required? ‎Yes

Product Description 【DOOR CHIMES for BUSINESS When ENTERING】Magnetic door sensor will automatically trigger the receiver when the magnetic stripe is separated 1cm and the receiver will alerts immediately whenever the door or windows is opened. It works great as an entry door bell and also helpful to know when visitors have come in. If our children and the elderly open doors and windows, we can also know in time 【600 FT RANGE & 20 DOOR SENSOR EXPANDABLE】The range of entry alert chime is 600 feet far enough to cover every door and window in your house. Each wireless doorbell receiver can pair up to 20 magnetic contact sensor(or call buttons) and each door sensor can add unlimited receivers. Our door chime can be widely used different occasion for your all of needs, such as your home, store, office and business 【EASY TO INSTALL】Door open chime don't need tool. Plug the receiver into socket, tear off the tape behind door sensor chime then paste on the door. The wireless door chime has been matched before shipment. If you need to replace music or add a transmitter, please re-pair, Also need to re-pair if you change the battery 【EASY PROGRAMMING】 55 chime options with blue light flashing and we could easily change them whenever we want. 5 levels of adjustable volume from 0-110 dB (Mute Mode Included). Different ringtones are set for different door sensors 【365 DAYS WARRANTY】 Our wireless door sensor is approved by FCC, CE and RoHS; we provide customer service on our products and we will always do our best to support you. Besides, we will offer 365 days warranty and 24 hours customers service. Any problems about door open chime, pls contact with our customer service team to get a full refund or replacement Alert when kids open the window   Alert when someone comes into the office Ensure home safety Alert if someone enters store   How To Change Ringtone & Pair The Door Chime? Step 1 Press the " forward " / " backward " button on the receiver to choose your favorite melody. Step 2 Press and hold down the volume button, until it makes a "Ding" sound and the receiver indicator flashes. Step 3 Separate the sensor quickly, it will makes a "Ding-Ding" sound and the receiver indicator flashes. Step 4 Separate the sensor again to confirm whether the current ringtone is the one you have set, if yes, the pairing is completed. How To Change The Batteries? Step 1 Gently move the cover of magnetic door sensor. Step 2 Remove the battery out to replace a new one. Designed for you   Dog Doorbells Pagers Emergency Alert Paging System Waterproof ✔ ✔ ✔ ✔ Maximum Signal Range 300 ft 300 ft 300 ft 720 ft Volume 5 Levels Volume 5 Levels Volume 5 Levels Volume — Ringtones 55 55 55 — Plug-in Receiver ✔ ✔ ✘ ✘ Technical Details Item Weight ‎9.5 ounces Package Dimensions ‎4.84 x 4.02 x 3.58 inches Country of Origin ‎China Batteries ‎2 AAA batteries required. (included) Is Discontinued By Manufacturer ‎No Size ‎2 Sensors Color ‎White Material ‎ABS Power Source ‎Battery Powered Voltage ‎260 Volts Item Package Quantity ‎1 Sound Level ‎55 dB Batteries Included? ‎Yes Batteries Required? ‎No Battery Cell Type ‎Alkaline