This transmitter used in the restaurant or other place need to wait in line and make customer enjoy the time when waiting 

Specification:

1. The main board have 30 buttons and can work with 30 pcs pagers SU-211

2. Wireless and easy to install. you can use it immediately with power

3. Coverage : 500M

4. Frequency is 433 MHz

5. More main board use in the same place even same restaurant  they will not interfere with each other,

    because each board and pager have unit code.