Door speaker module for the wire-saving 1+n system. Front-mounted shutter made of weather- and UV-resistant polycarbonate, tropical-proof speaker, durable electret microphone with volume control for the speaker. Features integrated automatic synchronization for multiple door speakers as well as potential-free working contacts for door openers and lighting. Control is done directly from the home phone via the wire-saving main installation. Connection options for SFC 602 and CTÖ 602. Acoustic feedback when pressing a call button on TM 612-1 to -4. Main features: Product color white, brand compatibility Siedle. Weight and dimensions: Width 99 mm, Depth 35 mm, Height 99 mm.