Further information for Telecom Behnke BT 20-855 - Door Phone Series 20 "industry standard" (4x horizontally)
Door Phone Series 20 - industry standard (4x horizontal) BT 20-855 consisting of: - Basic Electronics (for phones with integrated electronics) - Speaker Module - Tastwahlblockmodul unlit - Function module to door Series 20 phone and emergency call
Finish: Aluminum