CENTURION Wireless Photocell Sensor For Gate Opener Automation Gate Photon infrared gate safety beams deliver exceptional performance coupled with wireless technology Photon has a powerful 30 meter range with its key feature being it powered by 2 x Alkaline AA battery's on the far side of your driveway from the control box. The Receiving Beam closest to the control box still requires a 4 core security cable but this is often only a couple meters long and easy to add to an existing installation. So if cables where not previously run under the driveway you can still add Photon Safety Beams with battery changes only needed every 2 years. Photon-infrared-beams-manual-insert.pdf Centurion-Photon-Brochure.pdf