Video door intercom for surface mounting, with four call buttons in a robust housing made of ZAMAK alloy (IP44, impact resistance IK08). With super wide-angle color camera (170° horizontal detection) with zoom function, white light LED illumination (up to approx. 0.8m) and illuminated nameplate. Integrated RFID reader unit for controlling the door opener. Acoustic and optical signaling of the door opening. Reverse polarity protected 2-wire bus connection to a VT200 system power supply. Connection for door opener (ET100A or 12V DC, max. 250mA via bus supply or via integrated potential-free relay (24V AC/DC, max. 1A). Door opening time: adjustable 1-99 sec. Power supply: 24-29V DC, max. 3W from system power supply unit. Max. 4 door intercoms can be operated in the system. Delivery includes transponder chip (RFID tag) in key chain format and two management transponders. Dimensions: 90 x 176 x 26mm, with weatherproof housing: 95 x 180 x 40mm. Suitable accessories: additional transponder chips VT200TAG1, electric door opener ET100A, relay module VT200R (for controlling a door opener that does not meet the above specifications, for tamper-proof or second door opener).