Pay attention！！！ The watch can display call information from up to 4 buttons simultaneously on one screen. After more than 4 times, the oldest call information will move down and can be scrolled by using the up and down keys. The working distance is about 500Ft (in the open air), if you need a larger range and need to use it with a signal boosterSignal enhancement device product link:https://www.calltou.com/collections/calltou-accessories-1/products/calltou-sw05-sw06-watch-repeater-white-signal-booster         PAGER WATCH NO MONTHLY FEE For Both Caregiver and Patient/Elderly/Resident/Handicapped/Sick Freedom while Still calling for Help at home. Not need to Yell to Get Someone’s Attention. SMART CAREGIVER PAGER: Vibration or Audible Prompt for choice. Wake Up the night shift caregiver Only Transmitter/Push Call Button is Waterproof.  Both Pager/receiver and Call button are powered by Built-in battery. Pager battery are Rechargeable. Standby time about 3 days. DC 12V 23A Call button battery. Standby time about 1 years Tag：Alarm Watch with Vibrate/Wrist Paging System/Pager Watch User Manual Fast Delivery：We prioritize shipping from local warehouses in your country/region (such as the United States, Canada, etc.), and you will receive the package soon. Pay attention！！！ Each set is individually paired and ready to use. If you need to add more call buttons, it is also possible, but you need to re-pair, the specific pairing video can refer to this ：