Product DescriptionThe 5820A Recessed ShatterPro II is designed for use when sensor appearance is a consideration. The 5820A 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 Pattern Recognition Technology, the sensor listens for the actual pattern of breaking glass while eliminating most false alarm patterns. A new test feature makes installation faster by eliminating the test mode jumper. The sensor is tested by activating the hand-held glassbreak tester at close range.