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 SystemMaterial: ABSWatch Receiver Parameters: Operating Frequency: 433.92MHzCharging Voltage: DC5VBattery Type: 300mAh Lithium Battery (included)Operating Current: 10020mA (Vibration and Buzzer Mode), 7510mA (Vibration Mode)Standby Current: 105mAReceiving Sensitivity: -1072dBmDecoding: Learning CodeWaterproof Rating: IPX7Operating Temperature: -20 to 60Pushbutton Transmitter Parameters: Operating Frequency: 433.92MHzSize: Approx. 60x60x13mm / 2.4x2.4x0.5in Battery Type: 2 x 240mAh CR2032 Batteries (included)Transmit Current: 103mAStandby Current: <1uAOpen Distance: >100 MetersKeystroke: 1 Million TimesWaterproof Grade: IPX4Operating Temperature: -20 to 55Single Key: CALL.Package List:1 x Receiver4 x Transmitter1 x Charging Cable1 x Instruction ManualNote:All data are measured manually, and there are certain errors in the measurement results. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.