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The 5820A Series Recessed ShatterProâ¢ is designed for use when sensor appearance is a consideration. The 5820A recessed model can be mounted directly into the wall or ceiling or can be used with the single gang box accessory. A trim ring is included. Using our patented Pattern Recognition Technology,â¢ the sensor listens for the actual pattern of breaking glass while eliminating most false alarm patterns. Recessed ShatterPro sensors listen across the glass break frequency spectrum to differentiate the sound of breaking glass from most normal room sounds. The test feature makes installation faster by eliminating the test mode jumper. The Recessed ShatterPro is tested by activating the hand-held tester at close range. Opening the sensor is unnecessary. A simple hand-clap feature lets end-users confirm at any time that the Recessed ShatterPro is operational. The sensor will blink twice. The 5820A Recessed ShatterPro detects in a full 360Â° coverage pattern, with a 25′ (7.5 m) radius range from sensor to glass. The Recessed ShatterPro is suitable for use in quiet occupied areas on the perimeter loop.