Fire extinguisher Cabinet Alarms serve a dual purpose. They're the perfect early warning system when a small fire occurs, or the perfect way to deter vandalism. Either way, they're one useful cabinet accessory. Self-adhesive, 105-decibel alarms install in seconds. Powered by 9-volt batteries, sold separately. Colors: Red or White. Size: 2-3/4"H x 2-1/4"W x 1"D.