The BALLUFF BES 516-300-S135-S4-D is an inductive proximity sensor with a 1.5 mm detection range, operating at 10-30 VDC with a 1000 Hz switching frequency. It features a PNP normally open (N/O) configuration, M12 male 4-pin connector, and is constructed with stainless steel housing. The sensor operates within a temperature range of -25 to +80°C and has an IP68 protection rating.