Sensopart 600-11029 DC Diffuse (with Background Suppression) Photoelectric sensor with 30mm sensing range, Fixed focus adjustment, PUR housing, Body Size: 21.1x14.6x8mm³, NPN output, Normally Open/Normally Closed Selectable, Blue LED (450nm) emitter, Pre-wired 2 meter 4-wire cable, Short circuit protected, Reverse polarity protected, IP67 rating..