Miniature light barriers, W100 Laser, WS/WE100L-E2231, switching distance max.: 0 m ... 35 m, sensor principle: through-beam light barrier, switching output: NPN, switching type: light/dark switching, connection type: connector M8, 4-pin, light transmitter: laser, setting: potentiometer, laser class: 1, included in delivery: 2 stainless steel mounting brackets (1.4301/304) BEF-W100-A