Miniature light barriers, W4SL-3V, WTB4SL-3P2264VS02, switching distance max.: 40 mm ... 200 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: laser, setting: teach-in button, cable, laser class: 1