Miniature light barriers, W4S-3, WL4S-3P3130, switching distance max.: 0 m ... 4 m, sensor principle: reflection light barrier, detection principle: autocollimation, switching output: PNP, switching type: light switching, connection type: cable with plug M8, 3-pin, 100 mm, light transmitter: PinPoint LED, setting: none, communication interface: -