Speaker/Mic Module-2Wire-Brown Used with 2-Wire 'Alpha' Type S.T.R. Handsets and Brown Modular Style Panel(S). The TSMAB speaker/microphone is designed to be used with Alpha Communications®/ S.T.R.™ modular series door entry stations. The TSMAB is used with the standard 5-wire type apartment handsets (i.e. HT3003, HT2003, HT2006) and standard analog video-intercom systems. The TSMAB is used with the standard 2-wire type AlphaTone™ apartment handsets (i.e. HT3009, HT2009).
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