Feature: 1. MULTIPLE APPLICATIONS: Watch pager system adopts RF wireless technology, easy to operate, and has a wide range of applications, suitable for families, factories, hospitals and so on. 2. WATERPROOF: Wireless pager system comes with 4 watch receivers, waterproof grade IPX7, and 1 call button, IPX4 waterproof grade, guaranteeing long time use and reliability. 3. FLEXIBLE USE: Wireless watch pager system supports 4 channels, which can be freely combined and flexibly applied to meet different needs. Suitable for elderly care, emergency call function. 4. LONG BATTERY LIFE: Single watch receiver built in 300mAh battery, button built in 240mAh battery, rechargeable, super long standby time, low power consumption design, longer battery life. 5. LONG RANGE: Wireless watch calling system supports more than 100m open transmission distance, strong anti interference, fast transmission, accurate transmission. Specification: Item Type: Wireless Pager System Material: ABS Watch Receiver Specifications: Working Frequency: 433.92MHz Charging Voltage: DC5V Battery Type: Lithium Battery Battery Capacity of Single Watch Receiver: 300mAh (Included) Working Current: 100±20mA (Vibration and Buzzer Mode), 75±10mA (Vibration Mode) Standby Current: 10±5mA Receiving Sensitivity: -107±2dBm Decoding: Learning Code Waterproof Grade: IPX7 Working Temperature: -20℃ to 60℃ Button Transmitter Specifications: Working Frequency: 433.92MHz Battery Type: CR2032 x 2 Battery Capacity: 240mAh (Included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: More Than 100m/328ft Button Life: 1 Million Times Waterproof Grade: IPX4 Working Temperature: -20℃ to 55℃ Single Button: CALL. Package List: 4 x Watch Receiver 1 x Call Button 4 x Charging Cable 1 x User Manual