The BEAM-AL2B100 is one of 3 photoelectric beam accessories that can change how you think of motion detection for your camera systems.  By taking advantage of the alarm inputs of cameras and recorders you can trigger recording, mobile notifications, and computer software pop-ups whenever the infrared beam that is between a pair of beams is interrupted.  Fast (50-700ms detect speed with a near instantaneous 40ms trigger time) and accurate, this weatherproof dual-lens design allows for detection at up to 100m (328ft).  The BEAM-AL2B100 requires very little power, consuming only 90mA 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 @ 12v.  Do keep in mind 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.)