Alpha TSMB3W QwikBUS Speaker/Microphone Module, White Used with Qwikbus Type S.T.R. 2 / 4 Wire ‘Bus’ Stations Only and Modular Style Panel(S)

The TSMB3W speaker/microphone designed to be used only with modular series door entry stations. It is used with the 2-wire or 4-wire (loop) type QwikBUS™ apartment handset intercom stations, open voice apartment intercom stations and/or video monitor stations with handsets or open voice style. It features a weatherresistant speaker, long-life electret condenser microphone, illuminated dry-contact low voltage light push button and plug-in connector for easy wiring. It is 3.94″w x 3.94″h(100mm x 100mm), and is made to snap into the MT series modular panel trim frame(s). To service it, once installed, use the model 13510 key / tool unit.