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 SystemMaterial: ABSWatch Receiver Specifications:Working Frequency: 433.92MHzCharging Voltage: DC5VBattery Type: Lithium BatteryBattery Capacity of Single Watch Receiver: 300mAh (Included)Working Current: 10020mA (Vibration and Buzzer Mode), 7510mA (Vibration Mode)Standby Current: 105mAReceiving Sensitivity: -1072dBmDecoding: Learning CodeWaterproof Grade: IPX7Working Temperature: -20 to 60Button Transmitter Specifications:Working Frequency: 433.92MHzBattery Type: CR2032 x 2Battery Capacity: 240mAh (Included)Transmitting Current: 10mA3mAStandby Current: <1uAOpen Distance: More Than 100m/328ftButton Life: 1 Million TimesWaterproof Grade: IPX4Working Temperature: -20 to 55Single Button: CALL.Package List:4 x Watch Receiver1 x Call Button4 x Charging Cable1 x User Manual