1、WIRELESS OPERATION: Wireless restaurant service calling system adopts RF wireless technology, which is convenient to operate and suitable for various places. 2、WATERPROOF DESIGN: The watch receiver supports IPX7 waterproof, and the transmitter supports IPX4 waterproof, guaranteeing long time use. The operating frequency is 433.92MHz, high sensitivity. 3、SUPPORT MULTIPLE BUTTONS: Wireless caregiver pager calling system has 4 channels, supporting 4 buttons, which can be freely combined and flexibly applied. 4、LONG ENDURANCE: Wireless restaurant paging system built in high capacity battery, long standby time, rechargeable battery, low power consumption. 5、APPLICABLE PLACES: Wireless guest customer calling system is suitable for home, factory, hospital and other places to protect the elderly care, emergency call.Item Type: Wireless Restaurant Service Calling SystemMaterial: ABSWatch Receiver Parameters:Operating Frequency: 433.92MHzCharging Voltage: DC5VBattery Type: Lithium BatterySingle Watch Receiver Battery Capacity: 300mAh (included)Operating Current: 100±20mA (Vibration and Buzzer Mode), 75±10mA (Vibration Mode)Standby Current: 10±5mAReceiving Sensitivity: ‑107±2dBmDecoding: Learning CodeWaterproof Rating: IPX7Operating Temperature: ‑20℃ to 60℃Button Transmitter Parameters:Operating Frequency: 433.92MHzBattery Type: CR2032x2Press Lithium Battery Capacity: 240mAh (included)Transmit Current: 10mA±3mAStandby Current: 100 MetersKeystroke: 1 Million TimesWaterproof Grade: IPX4Operating Temperature: ‑20℃ to 55℃Single Key: CALL2 x Receiver1 x Transmitter2 x Charging Cable1 x Instruction Manual