The BALLUFF BES 516-326-SA96-S4-W (BES02JF) is an M18x1 threaded photoelectric sensor with Ø18x65mm dimensions, designed for flush mounting. It features a 5mm sensing range, PNP normally open (NO) switching output, and operates at 500Hz frequency. The housing is constructed from brass with PTFE coating, while the sensing surface utilizes ceramic material for durability.