The Universal Security Instruments SS-770 Battery-Operated Ionization Smoke and Fire Alarm responds quickly to fast-flaming fires to protect your family against deadly threats in the home. This alarm is operated by a 9-volt battery (included) and is suitable for installation in houses, apartments, dormitory rooms and mobile homes. Fast and easy to install with no wiring required, the SS-770 features an audible low battery indicator, a cover to protect against contaminants and an alarm/power test button to ensure that the device is functioning properly. All hardware is included to mount the round and flat plate that is designed for a quick installation. This smoke and fire alarm is UL Listed, California State Fire Marshal approved and Federal Housing Authority (FHA) approved to exceed industry standards. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The Universal Security Instruments SS-770 Battery-Operated Ionization Smoke and Fire Alarm comes with a 3 year limited warranty. Universal Security Instruments is a U.S. based manufacturer of high quality, easy-to-install home safety products. Founded in 1969, Universal Security Instruments has over 40 years of heritage in providing home safety products for families. With state-of-the-art manufacturing facilities, Universal Security Instruments continues to launch revolutionary new products and technologies with the mission of always working to keep families protected. Visit www.amazon.com/universalsecurityinstruments for more information on Universal Security Instruments and our extensive line of products.