Wireless Call System 20 X Buttons 1 X Receiver Pager System for Hotel Hospital Restaurant 100‑240V UK Plug Item Type: Hotel Pager System Material: ABS Frequency: 433.92MHz Receiver Size: Approx. 210 x 140 x 30mm / 8.27 x 5.51 x 1.18in Receiver Sensitivity: -105dB Decoding: Learning Code Waterproof Level: IPX4 Operating Temperature: -20℃ to 60℃ Mode SU 1K Button Transmitter Parameter Description: Frequency: 433.92MHz Transmitter Material: ABS Transmitter Battery Type: Alkaline Battery Transmitter Battery Model: 12V23A Transmitter Battery Capacity: 60mAh(built in) Transmission Current: 10mA±3mA Standby Current: <1uA Transmission Distance: >Approx. 200m / 656ft Button: 1 million times Waterproof Level: IPX4 Operating Temperature: -20℃ to 60℃ Single Key: CALL 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. Sold by-YJL official store