FAAC Gate Opener Accessories Photobeam Photocell Set Directional photocell with diagonal alignment. Angle of detection: +/- 4 degrees, Range: 100 ft Obstacle detection time: 10 ms, Housing protection IP54 Required power supply: 24-35 VDC, Output relay rating: 100 MA/24VDC Output relay: NO (normally opened) and NC (normally closed) Receiver and Transmitter provide reliable all-weather sensing