Audio-video loudspeaker unit for 2-wire system SB2 with terminal block, 1/4 CCD color video camera and LED lighting for the video camera. This loudspeaker unit is limited to up to four participants. Integrated equipment feature is the handicap function in accordance with DIN 18040 with status display door call, ready to talk, door opener function and participant availability visually with LEDs behind standardized handicap symbols as well as acoustic voice output of the statuses. Voice connection with echo suppression, dust and waterproof loudspeaker, electret microphone and adjustable loudspeaker volume on the front. Microprocessor and 8 DIP switch unit for addressing the participant addresses. Integrated electronic door opener function (3A) and additional relay contacts C, NC, NO with 10A. 33V DC supply via the corresponding power supply unit Art. 1209. For installation in modules Art. 1250iKV, 1250U, 33410(M), 33411(M) and 33412(M). Dimensions: 102x55x38mm.