Miniature light barriers, W4S-3 Inox, WTB4S-3F2234VS08, switching distance max.: 4 mm ... 280 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: dark switching, connection type: connector M8, 4-pin, light transmitter: PinPoint LED, setting: cable, teach-in button, communication interface: -