How it work of queue management system

Specification of call button 

Single key: NEXT                                                   
Signal Distance: 200M in open area     
Material: Acrylic+waterproof silicone  
Dimension: 110*55*30mm   
Color: Transparent with Black/Silver screen
With two 12V 23A battery

Specification of queue display

LED counter display labeled with Counter Number
1.Wireless signal receiver
2.Show 3-digit for display ticket number and 1 digit for counter number (1 line, 2 lines and 4 lines)
3.Show current calling number
4.Can put on the Waiting Area for indicate customer.
5.Touch screen and English prompt voice: Please number 001 go to counter 2.
6.Counter number can be alphabet, such as: C
7.Can install on the wall and desk.
8.110V-240V Power supply
9.Working voltage: DC12V
10.Dimension: 29*15.5*4cm
11.With high strength ABS plastic shell