Product Description Model: Call Pager Name: retekess Original:: CE, FCC Wireless Call System: Wireless Paging System Visitor Call Pager: Queuing System Transmitter: Coaster Pager Restaurant Equipment: Vibrating Restaurant Pager Receiver: Call Button Waiter Call System: Receiver Host Watch Receiver: Call Bell Hospital Nurse Calling System Wireless Call Bell Emergency Caller with SOS Button Transmitter Suitable for Elderly Patients Features and Specifications Watch Receiver: 1. Working Voltage: DC3.7V Rechargeable Lithium Polymer Battery 2. Working Frequency: 433MHz3. Receiving sensitivity: -108dBm4. Decoding: Learning code 5. Number of transmitters: Maximum 999 pieces 6. Modulation: AM7. Dimensions: 252 x 46 x 18mm/ 9.9 x 1.8 x 0.7 inches 8. Weight: 56g/ 2oz Call button: 1. RF frequency: 433.92MHz 2. Modulation mode: ASK (AM) 3. Working chip: Learning code 4. Power supply: 12V/23A battery (included) 5. Transmission distance: 200m (open area) 6. Working temperature: -10C to 50C 7. Weight: 30g / 0.06lb Note 1. It is recommended to charge for 8-12 hours for the first 3 times; during normal use , charging time is about 4 hours. 2. There is a plastic protective film on the watch, you just need to tear it off, it is a product, please don't worry. Package includes - 1 x watch receiver - 1 x power adapter (EU//AU/optional) - 1 x USB cable - 1 x user manual - 10 x SOS button transmitter Picture display