Wireless paging system use in 4S Car Store

1)A guest drives his car to 4S car shop. The stuff gives the guest a pager that 

has a ID number.The guest can wait around the shop.for example, to have a cup of coffee,etc.

2)When the ccar is ready, the shop stuff  will press the pager’s number on the transmitter.

The corresponding  pager vibrating or LED flashing or sounding, then guest knows he can

take his car now.