Product Description 【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   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)   Wireless door alarm with slient mode Mute mode or low tone mode could avoid waking up your sleeping baby /kids/child , just press the voice key to set. Wireless door buzzer entry systems with LED Indicator The LED on the receiver will light when the door is opened, good notification for the elderly with hard of hearing or when in mute mode , you can always receive an alarm. 55 different ringer for your choice Motion sensor doorbell has 55 ringtones（15 chime, 40 melody） with 5 adjustable volume levels for your choice, you can set different melodies so you can easily know which magnetic door contacted   door bells chimes is operated by batteries (a 23A 12V alkaline battery), normally, it can be used for at least 1 year. Entry alert chime with memory function. Thank to the menory function, our wireless doorbell and chime will remember and automatic play the previous tune you set even after a power outage 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. Package List: 2*Plugs-in door chimes+ 2* magnetics door sensores (battery included) +1* User Manual   Installed on almost all doors It can be installed on doors, glass doors, sliding doors, Windows, refrigerators, cabinets and other places. Technical Details Color ‎2 Sensors + 2 Receivers Power Source ‎Battery Powered, dc Connectivity Technology ‎Wireless Voltage ‎110 Volts Battery Cell Composition ‎Alkaline Sound Level ‎110 dB Manufacturer ‎SanJie Item Weight ‎9.6 ounces Package Dimensions ‎4.33 x 3.62 x 3.62 inches Is Discontinued By Manufacturer ‎No Batteries Included? ‎No Batteries Required? ‎No  

Product Description 🔔: Door alert for business has a back clip can be placed in the belt or pocket to carry around, without the restrictions of the socket more convenient to remind, when someone comes to visit, from anywhere in the house can hear the call, suitable for the elderly who are hard of hearing and friends with hearing problems (need to use batteries) 🔔[4 Modes for You to Choose]:CallToU Door Entry Chime 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 🔔[55 Chimes & 5 Adjustable Volume]:55 kinds of short ringtones, including "Ding Dong", "Bell Ringing, Christmas Song" and other music styles. It supports five-level volume adjustment, the sound range is 0-110db, the volume is very large, and the whole house can hear it, suitable for various occasions. Silent mode that won't interfere with other devices in your home or neighbors 🔔[Long-distance and Anti-interference]:Door Sensor Chime working distance up to 1000ft in open and barrier-free environment, long-distance remote control, stable signal, no interference with each other, in Any place in the home can receive the signal without delay 🔔[Easy to Install]: Please install after pairing,tear the double-side adhesive tape sticK to any doors or windows.The wireless entry alert chimes when door opens for home is small and light so can be installed in any flat places Door Chimes, Wireless Door Open Chime/Alarm for Home Business Office Store 500 FT Range, 4 Simple Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering You can use it as door chimes when door opens for business You can use it for door alert/alarm for kids safety/demontia You can use it as a pool alarm and prevent someone walks into the private sphere You can use it as pet alert and make sure they don't runaway from home You can use it as a night entry alert chime which can alert you to the insecure door opening, and put off burglars from going any further. Unique 4 Alert Modes Ringtone+Vibration Ringtone+Flash Ringtone+Vibration+Flash Ringtone 4 Simple Ringtone DIDIDI Ding-Dong Hello Welcome Alarm Sound   We believe our wireless door chime can meet all your needs above! Ringing + vibration + color flash This handheld receiver has 3 unique alert functions: ringing + vibration + color flashing, with a back clip design, you can put it on your desk or carry it with you, you can receive alerts immediately without delay, 0 false alarms, and no random ringing. Double-sided adhesive door magnetic sensor They are easy to install, the two parts need to be installed very close, when the two parts are separated by more than 0.4inch, it will send a signal, the receiver receives the signal and ring the bell; when the door is closed it will not trigger the signal. Battery powered receiver It is powered by 3*AAA batteries, you can carry it around with you, even when the power is off in your home, it can also work normally. We Have Paired Them Before Shippment,You Just Open and Play! Install the COntact Sensor Open the door to trigger the signal Receiver will ring+vibration+flash Deaf Doorbells CallToU Dog DoorBell Dog Door Bell Kit 2 Deaf Doorbells + 2 Call Buttons 2 Receivers + 2 Call Button Working Type Wireless Wireless Volume 120dB 5 Volume 4 Modes ✓ 55 Ringtones Technical Details Manufacturer ‎CallToU Place of Business ‎XiaoMing Deng,+8613960477124,room 605, building 2, hengdali factory,jinjiang city, Fujian Province Parcel Dimensions ‎9.7 x 8.6 x 7.7 cm; 230 Grams Batteries ‎2 12V batteries required. (included) Size ‎1 Receiver + 2 Sensors Power Source ‎Battery Powered Included Components ‎Battery door sensor Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline Warranty Description ‎1 year manufacturer Item Weight ‎230 g Country of origin ‎China

Product description WiFi Door Chimes when Door Opens - This WiFi alarm chime system can be connected to your mobile phone to your mobile phone to enable remote push notifications.This allows you to monitor your home anytime, anywhere, giving you peace of mind.When visitors arrive or toddler/dementia sneak out, the receiver will sound a chime, and your mobile phone will receive a warning notification.Note: Only supports 2.4GHz WiFi, does not support 5GHz Easy to Install and Use - Plug the receiver into an outlet no more than 33FT away from the router.Refer to the manual for quick connection of the receiver to the app: Tuya/Smart Life.After adding the sensor, remove the double-sided adhesive tape and attach it to the desired location: door/window/cabinet/refrigerator, etc.The maximum indoor distance between the sensor and receiver is 100FT 20 Chimes with Mute to 110dB - The WiFi door chime for business/home has 20 chimes with 5 adjustable volumes(0-110dB).With LED indicators and memory function: Keep the previous set tune after re-plugging it.The volume, chime, and name of each sensor can be set individually via the app.So that you can realize exactly which door is triggered Multiple Usage Scenarios - 1.Door chime for business when entering,you won't miss any customers.2.Door alarms for kids safety/dementia,when toddler, children with autism, or dementia patients wander off, you will be notified immediately to ensure their safety.3.Door/window alarms for home security,when the thief breaks into your home, you will be notified immediately.4.Any scenario you think you can use(office/apartment/nursing home, etc.) Expandable & Share with Family Notification - Each door opening chime can be paired up to 20 magnetic sensors.You can set the sharing function of the APP,so that when door/window alarm is opened, everyone you share it with can receive the alert message(APP notification free).Note: Only one phone can be connected to the Gateway through WiFi, others can only connect to the Gateway through sharing devices.Telephone or text message notification services are subject to a fee(subscribe as needed) Free App Notifications + Paid SMS/Phone Alerts - Our system offers a free app and app notifications, allowing you to receive alerts anytime, anywhere.For added security, you can upgrade to a paid service (subscription fee) to enable SMS and phone notifications.This ensures you receive alerts even without an internet connection when door window sensors are triggered WiFi Window Door Chimes When Opened WiFi Door Chime,Get Notification Anytime, Anywhere Router Connects to Receiver The receiver connects to the router via a 2.4GHz network only and does not support 5GHz.The distance between the two should be kept within 33 Feet ; the closer the distance, the better the signal. Receive Notifications via App Anytime, Anywhere App notifications are free, SMS and cell phone notifications require a fee.You can choose whether to subscribe to telephone or text message services according to your needs. WiFi Door Chime System Usage Distance The distance between the receiver and the router should be within 33 feet; the closer they are, the better the signal.The distance between the door magnet and the receiver indoors should be within 100 feet; the more obstacles there are, the shorter the distance.   Does the receiver connect to the network and only support 2.4GHz WiFi? Yes, only 2.4GHz WiFi is supported.5GHz networks cannot be connected.   Is there a charge for mobile notifications? There is no charge for app notifications.However, a subscription fee will be charged for SMS or phone notifications.   Is it easy to install and set up? Yes.It is very easy to install.Simply plug the receiver into a location within 33 feet of the router and place the sensor within 100 feet of the receiver.Follow the instructions in the manual to connect the app, and it is very easy to set up.   Are the chime and volume adjustable? Yes. There are 20 ringtones and 5 volume levels( 0-110dB.) You can also set the ringing time and delay time for each sensor separately. Technical Details Part Number ‎Sensors +Receiver Batteries ‎Lithium Metal batteries required. (included) Color ‎White Material ‎ABS Shape ‎Rectangular Power Source ‎AC Voltage ‎120 Volts (AC) Wattage ‎watts Installation Method ‎Screw-In & Self-Adhesive Capacity Description ‎500FT Sound Level ‎110 dB Mounting Type ‎Protruding Special Features ‎Easy to Install Usage ‎door chimes when door opens for home door chimes when door opens for business Included Components ‎Adhesive tape, Product manual, Receiver, Screws, Sensor (battery included) Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Lithium Metal Description Pile ‎3V Average Battery Life ‎1 years Warranty Description ‎Lifetime warranty

Product Description 【Adjustable Volume Door Alarm】door alarm with up to 120dB sound. Choose from 5 volume levels（0-120dB）to stay aware of loved ones leaving home and deter potential intruders effectively. Perfect for keeping your kid's or elderly safe. 【Door Alarm with Remote】The remote control and alarm signal can reach up to 65ft, making it very convenient and effective even if you're on the second or third floor. 【Door Chimes When Door Opens】The door sensor chime has different modes to match various scenarios. It can monitor pool and RV doors, and even serve as a door chime for business when entering, ensuring you never miss a customer again! 【Working Modes】1--Instant Alarm（it alarms when door opens，stops alarm when door closed immediately）2--Entry Doorbell（Just one welcome ring ding-dong) 3--Door Closing Reminder（the sensor emits "dididi"sound every 10 seconds until door is closed）4--Instrude Alarm (Alarm will last for 1 minute if your door is being open) 【Window Door Alarms for Home】The door open alarm uses 2 AAA alkaline batteries with low power consumption, providing over 12 months of battery life. It also features a low battery reminder to ensure timely replacement and peace of mind during use! Door and Window Alarms for Home Security This wireless magnetic sensor alarm is designed for home, office and store. It has 4 working modes and 5 volume levels that will alert you when a door or window is open, and you can adjust the volume to suit your needs. Door Alarms with Remote Control -------4 Working Modes SOS Button   4 Working Modes： 1--Instant Alarm（it alarms when door opens，it stops alarm when door closed） 2--Entry alert（Just one welcome ring ding-dong 3--Door closing reminder（the sensor emits "dididi"sound every 10 seconds until door is closed） 4--Instrude alarm mode (Alarm will last for 1 minute if your door is being open) SOS Button: When an elderly person in your home falls or needs help, press the SOS button and the door alarm will sound to alert you. Pool Door Alarms for Home Security Loud Features：Loud alarm, Added security, Easy to Use , Easy to Install, Quick Response, Real-time Alarm, Long Batteries Life, Multi Purpose Application, Compact Design Door Alarms for Kids Safety/Home Security/Dementia Patients/Pool/Refrigerator Technical Details Voltage ‎6 Volts Control Method ‎Remote Noise Level ‎120 dB Maximum Range ‎65 Feet Sensor Technology ‎Contact Sensor Item Weight ‎6.9 ounces Package Dimensions ‎4.37 x 3.15 x 2.83 inches Batteries ‎4 12V batteries required. (included) Size ‎2 Sensor+2 Remote Batteries Included? ‎Yes Battery Cell Type ‎Alkaline

Product Description 【Door Chimes】DOOR CHIME has been professionally tested, and we have also upgraded the door magnet, which has a longer service life and more durability to meet your needs for both daily and business use. 【Wireless & Easy Installation】-Wireless door chime helps you save the trouble of wire installation. Just need to plug in the receiver and stick the wireless door sensor on the door/window you want and set different ringtones to know which door is opened when entering. 【Protect the Safety of Your Family】-If you have elderly with dementia, the door open chime can protect your aged parents from going out without your knowledge. If you have naughty children who likes to sneak out, this wireless door buzzer can help you take better care of your children. 【55 Ringtones & 5 Volume】-The door entry alert is equipped with 55 kinds of ringtones of different styles for your choices. 5 levels volume adjustable, from silent to noisy(0-110 db), you don't have to worry about not hearing the sound. 【LED Number Display】-The LED indicator can display different numbers to help you easily distinguish which door is opened. 【Receiving Range of 500Ft/150m】-Large acceptable range allows you to know the arrival of customer on the first floor when you are working on the other floor which is suitable for business entry. Even the basement/garage can be covered, and the door chime can ensure that you can notice it immediately when they are invaded. 【Satisfactory After-Sales Service】-Amazon Logistics is our partner, we can quickly deliver the package to your home within 3-14 days, we provide a 30-day refund service.If there are quality problems with the  door chimes, please feel free to contact us. So as to give you the best shopping and using experience. Door Chimes When Door Opens Door Alarm Sensor         How to pair and select music? Step1 Press the “forward”/”backward” button on the receiver to choose your favorite melody. Step2 Long press the volume button for 5-7s until the receive "ding" with LED blinking rapidly. Step3 Quickly separate the two parts of door sensor to activate the transmitter to send a signal to the receiver. Step4 After successful pairing, when the sensor is moved, the receiver will sound to alert you that the door or window is opened. Door Chimes When Door Opens for Home

Product Description 🚪 - Bid farewell to the hassles of wired installations! Setting up our wireless door sensor is as easy as 1-2-3. Simply plug in the Receiver and attach the wireless door sensor to your door or window – it's that simple! Once paired, whenever your door or window opens, the receiver will instantly chime, providing you with peace of mind. 👨‍👩‍👧‍👦[ Protect Your Loved Ones ] - Safety always comes first. Our door chime system acts as a guardian, alerting you to any unusual activity. It's perfect for keeping an eye on kids sneaking out of their rooms or for added security when someone tries to open your door or window at night. It's not just a door chime; it's your family's safety companion. 🎶[ Customizable Alerts ] - Express your personality with 55 unique ringtones to choose from, ranging in style to match your preferences. Adjust the volume to suit your surroundings, with five levels of volume control ranging from a soft 0dB to a loud 110dB. Plus, the seven colorful LED flash indicators ensure you won't miss a thing, even when the receiver is muted. 📡[ Extended Range ] - With an impressive 1000ft (300m) open area range, our wireless door chime ensures that you'll hear the bell ring no matter where you are in your home or office. Whether you're upstairs, in the garden, or a few rooms away, this entry alert chime has you covered. Simply plug it into an outlet and attach the door sensor to any doors or windows. Door entry chime Door chime for business/home/store/apartment when entering,You will never miss a visitor For your safety CallTou is a company dedicated to security products, including wireless doorbells, bedwetting alarms, pet doorbells, etc.. As a development direction, we are committed to providing high-quality products. Versatile and affordable, we are always working to improve the design and quality of our products based on buyer feedback. wireless door sensor chime door chime for business when enterting door chime when door open for home wireless door alert door entry chime By Chime, CallTou Wireless By Entry Contact Sensor Alert 1000 FT Range, 55 Ringtones and 5 Volume Levels for Business/Store/Home/Office When Entering Do you worry about children or elderly people sneaking out of the house or opening windows while you are doing other things? Do you worry about falling asleep in the middle of the night when a bad guy opens your door to break into your bedroom? If you have a hearing impaired elderly, this receiver is with seven kinds of light flashing, even in silent mode can be used as a reminder to open the door. Our wireless door sensor chime can meet all your needs. 7 kinds of light flashing 55 ringtones and 5 volume (including mute mode) Easy to use/Easy to install Expandable System with the Same Brand Parts IP55 waterproof by sensor chime   Door Open Alarm for Business and Home As a store opening reminder Keeping your family safe Prevent your children from opening doors and windows   Why choose us？ 7 Colour Flash Light When someone rings the doorbell, the receiver will display 7 different colors. Provide additional protection for the hearing impaired. Even in silent mode, you will not miss the doorbell. Mute-120DB 55 types of ringtones and five volume modes can be adjusted, and you can set it to silent mode when you don't want to be disturbed, and the eye-catching flashing lights can also remind you Easy to replace battery Our wireless doorbell is very easy to replace the battery, when the battery life is up you only need to spend a small amount of money to go to the local grocery store can be buried 23A battery and then easily replaced to continue to use 1-2 years Waterproof By Sensor The wireless door sensor has an IP55 waterproof rating. You can use it with confidence whether it is installed indoors or outdoors.   Super easy to install Step1：Plug in the Reciever You can choose your own favorite ringtone Step2：Install the Contact Sensor Mind the 1cm max distance between two parts. Step3：Trigger the Door Sensor Chime This completes the installation   Believe CallTou Wireless Door Chime, You will Love It. Technical Details Manufacturer ‎CallTou Item Weight ‎0.317 ounces Package Dimensions ‎3.74 x 3.46 x 2.91 inches Size ‎1 Sensor&1 Receiver Color ‎White Material ‎ABS Power Source ‎AC Voltage ‎12 Volts Installation Method ‎Self-Adhesive Plug Format ‎A- US style Special Features ‎Easy to Install Included Components ‎Batteries Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline Description Pile ‎12V 23A

Product Description Wireless & Easy Installation: Wireless door chime helps you save the trouble of wire installation. Just need to plug in the receiver and stick the wireless door sensor on the door/window you want and set different ringtones to know which door is opened when entering. Protect the Safety of Your Family: If you have elderly with dementia, the door open chime can protect your aged parents from going out without your knowledge. If you have naughty children who likes to sneak out, this wireless door buzzer can help you take better care of your children. NOTE: The door chime can be connected to additional door sensors. 55 Ringtones & 5 Volume & LED Number Display: The door entry alert is equipped with 55 kinds of ringtones of different styles for your choices. 5 levels volume adjustable, from silent to noisy(0 db to110 db), you don't have to worry about not hearing the sound. The LED indicator can display different numbers to help you easily distinguish which door is opened. Receiving Range of 1000Ft/300m: Large acceptable range allows you to know the arrival of customer on the first floor when you are working on the other floor which is suitable for business entry. Even the basement/garage can be covered, and the door chime can ensure that you can notice it immediately when they are invaded. Door Chimes When Door Opens Door Alarm Sensor         How to pair and select music? Step1 Press the “forward”/”backward” button on the receiver to choose your favorite melody. Step2 Long press the volume button for 5-7s until the receive "ding" with LED blinking rapidly. Step3 Quickly separate the two parts of door sensor to activate the transmitter to send a signal to the receiver. Step4 After successful pairing, when the sensor is moved, the receiver will sound to alert you that the door or window is opened. Door Chimes When Door Opens for Home Technical Details Manufacturer CallToU Part Number ‎DS10BL 1-1 Item Weight ‎5.9 ounces Product Dimensions ‎3.9 x 1 x 3.9 inches Size ‎1 Sensor & 1 Receiver Color ‎Black Material ‎ABS Power Source ‎AC Sound Level ‎110 dB Plug Format ‎A- US style Included Components ‎MAGNETIC SENSOR*1 Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline

Product Description ♥ Different Advantages: Door chime wireless door sensor the screen is LED digital display, which can be matched with different music, the multi-set with LED digital display can let you know clearly which doorbell is ringing, and the LED indicator creates a visual LED alert for the hearing impaired, helping you to better protect your home.♥ Material Durable: Door sensor chime Designed with ultra-low power consumption for long battery life. Made of ABS material, sturdy and durable. It can be used for a long time, just replace the battery.♥55 Melodies & 5 Volume: This door entry chime alert for business has 5 levels of adjustable volume from 0-110 dB.Offer 55 elegant music from the traditional"Ding Dong" to various well know chimes.Memory function: Keep the previous setted tune after re-plugging it.         Multiple Functions   Use Operation   Use Scenario   Door Chimes When Door Opens for Home Children and elderly can know in advance when they go out Manufacturer CallToU Item Weight ‎5.3 ounces Package Dimensions ‎4.29 x 2.91 x 2.91 inches Batteries ‎1 12V batteries required. (included) Color ‎1 Receivers +1 Sensors Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Alkaline

About this item : This door window alarm is 120dB loud enough to inform you if the kids are trying to sneak out at night. And the noise scares toddlers so they won’t leave the house without you EASY TO INSTALL & USE - Easily mounted by adhesive, just tape it on the window or door then all is done! No wiring is needed! No screws are required! (NOTICE: MAKE SURE THE GAP BETWEEN THE ALARM AND MAGNET PART IS WITHIN 0.6IN.) Home Security Solution: Security Alerts are perfect for notifying you when there is an unwanted entrance. Protect your children or the elderly from leaving the room and causing danger, or prevent anyone from sneaking in and out. ULTRA-SLIM DESIGN: Ultra-thin door and window alarms with 2 adjustable settings modes (off/on), the simple switch allows you to quickly turn off and on when you need it, with no need to reset. 3xLR44 batteries included per alarm WHAT YOU GET – SANJIE 5-pack window door alarm. We will provide 100% customer satisfaction service and 24*7 customer support.   These door alarms with an ultra-slim build and sleek design can be put easily wherever you need them Batteries: 3 LR44(included) Size: 1.5" x2.9"/0.4"x1.2"(1 pack) Weight: 0.11lb(1 pack) Pack: 5 packs Notice: Not UL-2017 compliant! BEST & SIMPLISAFE ALARM SYSTEM FOR HOME About CallToU CallToU door and window alarms for home is used around the house or office, apartment, basement bedroom to prevent access to any doors, windows, cabinets and drawers— anything that opens and closes. What is our vision? Our vision is make you and your family feel safe,give you and your family peace of mind,and make the life better. What kind of security product do we provide? We provide door chime,window alarm,PIR motion sensor,doorbell to keep you security. 120dB Loud Alarm Enough Easy to Install & Use and Very Sticky. Small and Barely Noticeable. 12 Months Battrey Life and Low Battery Indicator. Window Alarms for Kids Safety Door Alarms for dementia elderly Window Alarms For Home Security Easy to Install The door and window alarms are easy to use. Just remove the label and stick it to your door or window. Small and Sticky The alarm is small and barely noticeable. Lightweight and sticky so you don't worry about falling. 120dB Loud Alarm Enough If someone is breaking into your home or you want to deter someone, it's loud enough to alert you and warn someone.   Technical Details Manufacturer ‎SanJie Part Number ‎YYDOA01 Item Weight ‎6.4 ounces Product Dimensions ‎3 x 1.5 x 0.8 inches Country of Origin ‎China Batteries ‎3 LR44 batteries required. (included) Is Discontinued By Manufacturer ‎No Power Source ‎Battery Powered Item Package Quantity ‎1 Sound Level ‎120 dB Special Features ‎real-time sound alarm, wireless Batteries Included? ‎Yes Batteries Required? ‎Yes Battery Cell Type ‎Silver Oxide