Feature: 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. Specification: Item Type: Wireless Restaurant Service Calling System Material: ABS Watch Receiver Parameters: Operating Frequency: 433.92MHz Charging Voltage: DC5V Battery Type: Lithium Battery Single Watch Receiver Battery Capacity: 300mAh (included) Operating Current: 100±20mA (Vibration and Buzzer Mode), 75±10mA (Vibration Mode) Standby Current: 10±5mA Receiving Sensitivity: ‑107±2dBm Decoding: Learning Code Waterproof Rating: IPX7 Operating Temperature: ‑20℃ to 60℃ Button Transmitter Parameters: Operating Frequency: 433.92MHz Battery Type: CR2032x2 Press Lithium Battery Capacity: 240mAh (included) Transmit Current: 10mA±3mA Standby Current: <1uA Open Distance: >100 Meters Keystroke: 1 Million Times Waterproof Grade: IPX4 Operating Temperature: ‑20℃ to 55℃ Single Key: CALL. Package List: 2 x Receiver1 x Transmitter2 x Charging Cable1 x Instruction Manual