Small light barriers, W12, WTB12-3N2431, Device type: Light sensors and light barriers, Switching distance max.: 20 mm ... 350 mm, Sensor principle: Reflection light sensor, Detection principle: Background suppression, Switching output: NPN, Switching type: Light/dark switching, Connection type: M12 connector, 4-pin, Light transmitter: LED, Light type: Visible red light, Adjustment: Potentiometer, Included in delivery: 2 x clamp holder BEF-KH-W12, incl. screws