Feature: 1. 1 Host Controls 20 Pager: Twenty different codes can be sent through a combination of the numbers 1?20. This queuing system greatly improves work efficiency. 2. Multifunctional: Equipped with low battery charging indicator, learn code registration mode, online search, vibration, sound, light flash, can be switched at will prompt. 3. Professional Processing Chip: Adopt imported processing chipset, high performance noise reduction coding and decoding circuit, fast heat dissipation, strong stability. 4. Receiving Range: External antenna partition wall receiving range of 50?100m, open area operating range of about 1000m (3280 ft). 5. Widely Used: Widely used in fast food restaurants, food courts, pizza parlors, and auto shops or other places where many customers are waiting to be served. Specification: Item Type: Wireless Calling System Material: ABS Keyboard Transmitter: Operating Frequency: 433.92mhz Working Current: 200??30mA Standby Current: 60??10mA Encoding Method: Learning Code Operating Temperature: -10??-60?? Disc Receiver: Operating Frequency: 433.92mhz Standby Current: < 14??3ma Working Current: 70??20ma (buzzer) 100??20ma (vibration) 120??20ma (vibration + Buzzer) Reception Sensitivity: -107??2dbm Battery Type: Lithium Battery Single Receiver Battery Capacity: 200mah (including) Decoding Mode: Learning Code. Package List: 1 x Keyboard Transmitter 20 x Receiver1 x User Manual1 x Adapter