With the enclosed optics and highly sensitive photodetector this light barrier has a max. range of up to 50m! The infrared light ray is invisible for men. If the light ray between the transmitter and receiver is interrupted (if a person walks through it) the relay in the receiver switches. Operating voltage transmitter 9 V/DC Current consumption transmitter approx. 100 mA Operating voltage receiver 12 V/DC Current consumption max. approx. 50 mA Range maximal approx. 50 m Relay contact receiver 1 x switch-over, max. 25 V 3 A Size of board tr