The BALLUFF BES 517-398-SA3-C (BES03N5) is a block-style photoelectric sensor with dimensions of 28 x 10.5 x 16.3 mm, designed for flush mounting. It features a 2 mm sensing range, PNP normally open (NO) switching output, and operates at a switching frequency of 5000 Hz. The housing and sensing surface are constructed from durable PA 12 material.