Adjustable photocells FAAC XP 20B D wall-mounted 20M BUS Mod. 785103 The new XP 20 D adjustable photocells comprise a transmitter and a modulated infra-red receiver with a range of up to 20 m. The obstruction of the light beam causes the receiver status to change. System with BUS 2 easy power supply, just two 24V non-polarized wires, possibility of installing up to 16 pairs of photocells on the same system and protection from interference produced by external light sources (such as vehicle LED headlights). The new XP 20B D photocells, both wall-mounted and column-mounted, allow the mechanical reduction of the beam along the horizontal axis of 180° (-90° +90°) and feature a vertical optical self-alignment function which is particularly useful when the area to protect is not entirely flat. Extremely compact size: 41 x 130 x 42 mm. Possibility of cable inlet both from the rear and from the underside of the casing (16 mm) and of columnmounting.