Miniature light barriers, W4S-3 Inox Hygiene, WTB4S-3N1132H, switching distance max.: 4 mm ... 120 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: NPN, switching type: light/dark switching, connection type: cable, 4-wire, 2 m, light transmitter: PinPoint LED, setting: teach-in button, communication interface: -