FAAC one pair XP15B Bus photocells.

Surface Mounted, Operating ambient temperature -20C to +55C, Absorption 10mA, IP54protection class, type of alignment automatic, obstacle detection time 20ms, Detection angle 7degree (15m) 13 degree (5m), Range 15m, Contact Type BUS (2easy), Power supply fromBUS 2 Easy with two 24v non polarised wires, Dimensions 105 x 35 x 25mm, 16 units can be linked together.