Wireless Caregiver Watch 1 to 10 RF Technology Removable Rechargeable Battery Time Display Wireless Calling System for Clubs Item Type: Wireless Caregiver Watch Material: ABS Description of Receiver Parameters of SU R169 Watch: Operating Frequency is 433.92MHz Operating Voltage: DC3.7V Type of Battery: Lithium Battery Battery Capacity: 400mah(included) Operating Current: 57mA±10mA (buzzer mode) and 95mA±10mA (vibration mode) Standby Current: < 8mA Power Off Current: 180±5uA Receiving Sensitivity: -108dBm Decoding: learning Coding Waterproof Grade: IPX4 Operating Temperature: -20℃~ 55℃ Parameter Description of Model SU C01 (black) Button Transmitter: Operating Frequency is 433.92MHz Battery: DC12V Type of Battery: Alkaline Battery (23A12V battery) Single Receiver Battery Capacity: 60mAh (included) Emission Current: 10mA±3mA Standby Current: < 1uA Open Distance: > 200m Press Key: 1 Million Times Waterproof Frade: IPX4 Operating Temperature: -20℃~ 55℃ Single Key: CALL