Sensopart 600-11040 DC Diffuse (with Background Suppression) Photoelectric sensor with 50mm sensing range, Fixed focus adjustment, PUR housing, Body Size: 21.1x14.6x8mm³, NPN output, Normally Open/Normally Closed Selectable, Blue LED (450nm) emitter, Pig-tailed 0.2m cable with M8 4-pin pico termination, Short circuit protected, Reverse polarity protected, IP67 rating..