Compact light barriers, W250-2, WTB250-2P2451, switching distance max.: 200 mm ... 1,000 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: connector M12, 4-pin, light transmitter: LED, setting: potentiometer, included in delivery: mounting bracket BEF-W250