Alpha DTSMB Speaker MIC Modular Brown

The DTSMB is a speaker/microphones are designed to be used with digital-dial modular series door entry stations. the 2-wire (loop) type ReliaBUS apartment handsets (i.e. HT3011, HT2011) only. Speaker/microphone modules feature weather-resistant speaker, long-life electret condenser microphone, illuminated drycontact low voltage light push-button and plug-in connector or easy wiring. 3.94"w x 3.94"h (100mm 100mm), made snap into panel trim frame(s).