The BES M12EI-PSC40B-S04G-S01 is a photoelectric sensor with Ø12x65mm dimensions, featuring an M12x1 threaded housing for flush mounting. It offers a 4mm sensing range, PNP normally open (NO) switching output, and operates at 500Hz frequency. Constructed with stainless steel housing and PTFE coating, the sensor surface is designed for durable performance.