First Alert P910 Sealed Battery Tamperproof Smoke Alarm, 3 V Pvc Compression Fittings Size: up to 2-7/16"

Size: up to 2-7/16"

Has the option of self-cleaning

Built-in pressure regulator

Size : 2x18

First Alert P910 Sealed Battery Tamperproof Smoke Alarm, 3 V Pvc Compression Fittings Size: up to 2-7/16"Highlights: Tamperproof sealed alarm powercell cannot be removed Silence feature Power LED and alarm indicator End of life signal Versatile mount wall or ceiling, Slide in mounting bracket Tamper resistant 10% to 95% relative humidity range Electronically simulates smoke condition, causing the unit to alarm, press and hold test silence button Automatic when smoke clears Usage for apartments, dormitories, hospitals, hotels and motels Note: Restricted