Restraunt Serve-me system(transmitter)

Restraunt Serve-me system(transmitter)
Item: ANT-T88 Name: Restraunt Serve-me system(transmitter)
Descriptions: 1.wireless,no wirings required,use the receiver of ANT-P18.
 2.Put on table,with slot that can hold the menu or napin and etc other things
3. With 3 different functions buttons:Service,bill,refill drink
4.A red LED indicator while press the button.Need-service called!
 5. One 12V battery operated
 6. Size:85*40 mm