The SICK WTB12-3P2431 is a compact background-suppression photoelectric proximity sensor using visible red LED light. It delivers reliable detection across a range from 20 mm to 350 mm. The sensor features a 5-turn potentiometer for precise adjustment, PNP complementary (light/dark-switching) output, fast response, and is built for demanding environments with its robust metal housing and IP66/67/69K protection.