Carlo Gavazzi Photoelectric Sensor Fiber Optic, M18 Nickel Plated Brass Housing, Fiber Dependent Typ. 100mm Adjustable, NPN NO & NC Switching, Cable, 10-40VDC Used in through-beam, retro-reflective or diffuse-reflective applications depending upon how the additional fibers are mounted. Easily adjustable sensitivity with 270° potentiometer. LED indication for output ON. Short M18 metal housing for heavy duty applications. The fiber allows positioning and mounting in tight spaces with the photoelectric sensor itself mounted in a more convenient location.