The 990MO RED BLANK MB 28 is a push button switch product designed primarily for access control applications by RCI by dormakaba. It features a 2-3/8" (60mm) diameter blue button and is offered with either a handicap label or blank faceplate to suit different installation needs. The faceplate is made from extruded aluminum with a 1/4" thickness and beveled edges, ensuring tamper resistance and durability, available in Brushed Anodized Aluminum or Dark Bronze finishes. This product mounts quickly to single gang surface or recessed electrical boxes and narrow-stile door frames, and includes a hardware kit with stainless steel tamper-proof screws and a spanner bit for secure installation. It supports momentary, maintained, or time-delay switch configurations, providing versatile operation options.