Alpha DTSM3B Speaker MIC Modular Brown

The Alpha DTSM3B speaker mic module is built for use with digital-dial modular door entry systems. It fits with 2-wire ReliaBUS apartment handsets such as the HT3011 and HT2011 models.

This unit features a weather-resistant speaker and a long-life electret condenser microphone. An illuminated dry-contact low voltage push-button is integrated for ease of use. It includes a plug-in connector to simplify wiring during installation.

The module measures 3.94 inches square (100mm x 100mm) and snaps securely into compatible panel trim frames. The outer casing is made from durable brown plastic for outdoor environments.