Spec Sheet Preview: The Alpha Communications® WST520 Door/Window Egress Wireless Transmitter is for use with the AlphaEcall™ 200 series (AlphaECall200) Wireless Emergency Call System. The WST520 is based on EchoStream® spread spectrum technology and transmits signals at the 900 MHz frequency. The WST520 sends supervised signals to the AlphaEcall™ 200 series system at a selectable interval, making it ideal for both high security installations and residential installations. The WST520 includes two built-in magnetic reed switches in a tamper-proof case for maximum flexibility. The magnet supports a 5/8" …