When customers need to order, they can push the button on the table. 

The table NO. will show on the screen of the receiver host and the watch.

Then waiter will know which table calling. Then he goes to the table and provide services. 

This system can also be used for emergency calls.

After pushing the call button, the display will broadcast and the pager watch will vibrate and ring.

And display and watch both will show the number which is calling.

So the receiver can provide service immediately.