Miniature light barriers, W100-2, WT100-2P4419, switching distance max.: 4 mm ... 140 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: connector M8, 4-pin, light transmitter: LED, setting: potentiometer, included in delivery: mounting bracket BEF-W100-A