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 rating, and the transmitter supports IPX4 waterproof rating, ensuring durability and long-term use. Operating frequency is 433.92MHz with 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 features a built-in high-capacity battery, long standby time, rechargeable power source, and low power consumption. 5. APPLICABLE PLACES: Wireless guest customer calling system is suitable for home, factory, hospital, and other environments, ideal for elderly care and emergency alerts. Specification: Item Type: Wireless Restaurant Service Calling System Material: ABS Watch Receiver Parameters: Operating Frequency: 433.92MHz Charging Voltage: DC5V Battery Type: 300mAh Lithium Battery (included) Operating Current: 10020mA (Vibration and Buzzer Mode), 7510mA (Vibration Mode) Standby Current: 105mA Receiving Sensitivity: -1072dBm Decoding: Learning Code Waterproof Rating: IPX7 Operating Temperature: -20 to 60°C Pushbutton Transmitter Parameters: Operating Frequency: 433.92MHz Size: Approx. 60x60x13mm / 2.4x2.4x0.5in Battery Type: 2 x 240mAh CR2032 Batteries (included) Transmit Current: 103mA Standby Current: 1uA Open Distance: 100 Meters Keystroke: 1 Million Times Waterproof Rating: IPX4 Operating Temperature: -20 to 55°C Single Key: CALL Package List: 1 x Receiver 4 x Transmitter 1 x Charging Cable 1 x Instruction Manual Note: All data are measured manually, and there are certain errors in the measurement results.