PiSector Long Range Wireless Paging System for hospitals, clinics, restaurants, clubs Work with 99pcs 3-keys(call,bill,cance)l transmitters, when press call key in the transmitter button, table numer of light is solid, when press bill key, the table number of light will falsh Rolling display the last uncancelled number. The call can be cancelled via "Cancel"button on the transmitter It can save 10 calling info in turn