The BES516356E5CS4 (BES00UY) is an inductive proximity sensor with a 4 mm detection range, operating at 10-30 VDC and 2500 Hz frequency. It features a PNP normally open (N/O) configuration with an M12 male 4-pin connector, non-flush mounting style, and operates within a temperature range of -25 to +70°C. The sensor is rated IP68 for dust and water resistance.