The BEAM-AL4B250 is our longest range photoelectric beam emitter, capable of shooting a quad-beam infrared signal up to 250m (820ft) to give you another way to customize how your CCTV system records and gives you notifications. Try triggering a PTZ tour on a property line or zoom in on a far-off, fixed location when someone walks by one of our brand new sensors. Take advantage of the alarm inputs of cameras and recorders to trigger recording, mobile notifications and computer software pop-ups whenever the infrared beam that is between a pair of beams is interrupted. This weatherproof quad lens design is fast (50-700ms detect speed with a near instantaneous 40ms trigger time) and accurate. The BEAM-AL4B250 requires very little power, consuming only 110mA of 12-24V DC power. This will allow you to split off camera power without affecting camera performance in the slightest or install your beam from up to 189m (620 ft) from its power source using AWG22 cable from a 12v power source. Please note during installation that each beam will require a power source. Its simple NO/NC alarm output works with any alarm input, allowing it to be used creatively on a diverse range of devices (you can even use it as a RTE on an access control system.)