Miniature light barriers, W4S-3 Inox Hygiene, WL4S-3P5230H, switching distance max.: 0 m ... 4 m, sensor principle: reflection light barrier, detection principle: autocollimation, switching output: PNP, switching type: light/dark switching, connection type: connector M8, 4-pin, light transmitter: PinPoint LED, setting: none, communication interface: -