The AURURA Outdoor 30m is a pair of dual Infrared digital pulse beams requiring both beams interrupted simultaneously to generate an alarm. They have a detection distance of up to 30 metres. They have fresnel lens for defined and precise infrared beam transmission and use fuzzy logic for external interference rejection. Automatic Gain Control (AGC) Circuit - continually monitors for gradual changes in the signal’s strength caused by changing weather conditions. In addition, they have LED Indicators for quick installation and a built in LCD Volt meter for quick alignment. They are IP66 rated thereby making them suitable for outdoor use.