Wireless Wrist Pager Multipurpose IPX7 Waterproof 433.92MHz Watch Pager for Restaurant Paging System 2 for 1 Item Type: Wireless Wrist Pager Model SU 691 Watch Receiver Parameters Description: Operating Frequency: 433.92MHz Material: ABS Charging Voltage: DC5V Operating Voltage: DC3.7V Rechargeable Lithium Battery Operating Current: 75±10mA (Vibration, Buzzer Mode) 75±10mA (Vibration Mode) Standby Current:10±5mA Receiving Sensitivity: -107±2dBm Decoding: Studycode Waterproof Rating: IPX7 Operating Temperature: -20℃-60℃ Battery Type: Lithium Battery Battery Capacity: 300mAh (Included) Model SU D1 Button Transmitter Parameters Description: Operating Frequency: 433.92MHz Battery Type: Alkaline Battery Battery Type: 12V23A Battery Capacity: 60mAh (Included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Range: Approx. 100-200m / 328.1-656.2ft Push Button: 1 Million Times Waterproof Rating: IPX7 Working Temperature: -20℃-60℃ Single Key: CALL Applicable: Widely used in homes, factories, workshops, clubs, bowling alleys, massage rooms, churches, casinos, golf and country clubs, hospitals, health clubs, elderly call alarms and offices, etc.