Miniature light barriers, W4S-3 Inox, WTB4S-3P2232V, switching distance max.: 4 mm ... 120 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: PinPoint LED, setting: teach-in button, communication interface: -