How it work of queue management system

Specification of call button 

Ultra-thin button
Simple to operate with a CR2025 battery
Smooth surface for plastic case and waterproof silicone
Add the number one by one
Dimension: 60*60*10mm

Specification of queue display

LED counter display for queuing
1.Wireless signal receiver
2.Show 3-digit number
3.Show current calling number
4.Can put on the Waiting Area for indicate customer.
5.Touch screen and English prompt voice
6.Can install on the wall and desk.
7.110V-240V Power supply
8.Working voltage: DC12V
9.Dimension: 29*15.5*4cm
10.With high strength ABS plastic shell