How to work of restaurant service call system

wireless calling system widely used in the service area. It is the button for guest use. When the guest need what service, he or she just press the button near them, the desk number will be displayed in the music or watch pager warning voice. 
Therefore, the waiter can provide very timely service.It makes communicating with guests simply and efficiently. Keep customers informed, staff aware, and operations running smoothly, satisfy the customer and the server at the same time. Welcome to choose the wireless calling system device. 

Specification of K-400 neck pager

Hang on the neck
1. Can work with 500pcs multi-key transmitter in max
2. Can show 3 group call number in one time 
3. Show 4-digit number from 0001-9999 and first alphabet can be A-Z
4. Can indicate different service type via words or alphabet ( call; bill; drink; dessert; help etc and A-Z)
5. Can record when the calling come in and count the call times of each number 
6. Can track the history of calling info by up and down
7. Show current time when stand-by
8. 3 reminder ways: sound prompt and vibration or both 
9. Battery is rechargeable: 3.7V Lithuim battery
10. Dimension: 70*42*16mm
11. Color: Red and Black
12. Output: DC5V--1A

Specification of table buzzer

Single key: Call                                                   
Signal Distance: 200M in open area     
Material: PC  
Dimension: 60*60*30mm    
Color: white; black; blue; yellow; gray; red                                
With a 12V 23A battery
Any language any logo is acceptable