Miniature light barriers, W2S-2, WTB2S-2P3251, switching distance max.: 1 mm ... 150 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: cable with connector M8, 4-pin, 200 mm, light transmitter: PinPoint LED, setting: potentiometer, communication interface: -