Miniature light barriers, W8, WTB8-N2231, switching distance max.: 30 mm ... 300 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: NPN, 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