Further information for Telecom Behnke BT 20-211 - Door Phone Series 20 "industry standard" (3x normal)
Door Phone Series 20 - industry standard (3x normal) consisting of: - Large basic electronics for phones with integrated electronics (up to 8 RT 1 TWB, 1 LP, 1 MIC, 2 BO, 1 AL, 1 VID, electronics extension possible). - Module with Speaker (large
Finish: Aluminum