Designed for use in drop ceilings where the ultimate in visibility is required with 360º viewing. Scan unguarded aisles, eliminate blind intersections, monitor production areas and safeguard entrances and exists. Detection mirrors are curved to eliminate distortion. No tools required, just remove ceiling tile and drop in the mirror. Great fit and finish. Plexiglas. Diameter: 24 in; Width: N/A; Height: N/A; For Area: 175 sq. ft.