Miniature light barriers, W4S-3, WTB4S-3P3234, switching distance max.: 4 mm ... 120 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light switching, connection type: cable with connector M8, 4-pin, 100 mm, light transmitter: PinPoint LED, setting: cable, teach-in button, communication interface: -