The Alpha Communications TekTone NC510UL Receiver enables communication between transmitters and the NC510UL Master Station Computer in a TekCARE 500 Wireless Emergency Call System. The NC510UL facilitates the supervision of all transmitters. The NC510UL's EchoStream 900 MHz spread-spectrum radio provides reliability, even in hostile or difficult radio environments. EchoStream technology minimizes nulls or dead spots. The NC510UL Receiver includes a slot through the side of the plastic case for wiring. Transmitters are programmed using default information stored in the receiver.