Boost reliable object detection in tight spaces with the Balluff BOS0297 (BOS R81K‑NA‑RD10‑S4), a compact diffuse photoelectric sensor in the R81K housing that delivers a 5–300 mm sensing range with a highly visible red LED (660 nm), NPN NO/NC switching, and a quick‑connect M12 4‑pin interface for easy wiring. Designed for durability, it features an IP67 ABS/PMMA body sized 15 × 48.9 × 31 mm, an adjustable 270° sensitivity potentiometer, and a generous 18 × 18 mm light spot at 300 mm for stable detection of varied surfaces; a mounting bracket is included to streamline installation—ideal for packaging, material handling, and general machine building.