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Disc is the smallest 360o ceiling-mount PIR detector available today. Boasting a miniature size of 8.6cm (3-3/8 inches) and sleek elegant design, Disc blends inconspicuously into any d?ecor. Into this miniature unnoticeable housing, Visonic packs a powerful combination of features, for maximal performance, reliability and false alarm immunity. Standard features include: a high-quality, low-noise dual-element detector; 360o detection pattern; floor coverage of up to 10.8m (36 ft), adjustable pulse counter, and more.