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Designed for Marine use. CMD-6 with new internal circuit board. Visible and audible alarm. Permanent deactivation method. Drip proof and salt spray corrosion tested. Chemical and solvent resistant housing. 3.5" H x 3.5" W x 1.2" D. Mounting bracket and screws included. Conforms to UL STD 2034. Appoximate 7 year life.CMD6-MB (Battery models): Permanent lithium-metal internal battery for power. Eliminates battery draw, circuit breaker and wiring - lower installed cost! CMD6-MB (Battery models): Permanent lithium-metal internal battery for power. Eliminates battery draw, circuit breaker and wiring - lower installed cost!