No need to search for customers anymore, just press the “call” button, and the calling device will ring loudly to alert the customers. It can improve work efficiency; avoid staff chaos; and maintain social distancing; widely used in restaurants. It relies on 3 signaling modes: vibration, buzzing, and vibration + buzzing to make it suitable for different situations. LED screen with three digits, the keyboard transmitter can expand to a maximum of 999 channels to work with a 999 receiver. You can always add more routers to the system as your business grows. Each restaurant calling device is equipped with a rechargeable battery of 3.7 volts 360 mAh; an indicator to identify low battery; works for about 24 hours after a full charge.