Thru-beam sensor (pair) OBE15M-18GM40A-SE0, Thru-beam sensor (pair), Thru-Beam Sensors, Strong metallic housing in cylindrical shape M18 x 1, Not sensitive to ambient light, Degree of protection IP67, Very high detection range, Detection of small parts or flat objects from 0.3 mm, Highly visible LEDs for Power ON and switching state, Easy to use