OPTEX optex active ir outdoor barrier, wireless, 1 channel. 2 beams. outdoor detection range 60 m (maximum indoor infrared range 265 m), self-powered, operates on batteries (not included). anti-fogging. anti-freeze. adjustable response time. automatic gain control. optical alignment pointer. wired transmitter option, alignment measurement output for precise adjustment. low battery status indication, tamper on front cover and rear housing.