Qwikbus Spkr/Mic Module--White. Used With Qwikbus Type S.T.R. 2 / 4 Wire 'Bus' Stations Only And Modular Style Panel(S)

The TSMB3 series speaker/microphones are designed to be used only with Alpha Communications® / S.T.R.™ QwikBUS™ modular series door entry stations. The TSMB3 series 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. All TSMB3 speaker/microphone modules feature a weather-resistant speaker, long-life electret condenser microphone, illuminated dry-contact …