Alpha Speaker MIC Modular Brown

Speaker/microphones are designed to be used with digital-dial modular series door entry stations Used with the 2-wire (loop) type ReliaBUS apartment handsets (i.e. HT3011, HT2011) only Speaker/microphone modules are 3.94"w x 3.94"h (100mm x 100mm) Made to snap into the modular panel trim frame(s)