How to work of wireless calling system

When the guest need any service, they can press the button on the table, the table number will be showed on the RECEIVER of watch or display screen with clear “dingdong” sound or vibration. So the waiter could offer service very timely.

Specification of Number display receiver

1. With high strength ABS shell.
2. Show number from 1-32, can show 32 numbers at the same time. 
3. Show different service type via F1 F2 F3
    (F1 =Call, F2 =Bill, F3 =Drink )
4. It can work with 32pcs call buttons in max
5. It can save 32 calling info in turn
6. Output: DC7.5V
7. Dimension: 195*135*30mm
8. Color: Balck and white
9. Touch screen

7 segment display need work with wireless transmitter