Miniature light barriers, W8, WL8-P2231, 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: LED, setting: potentiometer, communication interface: -, included in delivery: stainless steel mounting bracket (1.4301/304) BEF-W100-A, reflector P250