The combination of the sensor and First Alert's Nuisance Free Technology will reduce false alarms that result from cooking and shower steam. This smoke and fire alarm includes power LED and alarm indicator, end of life signal and mute and silence button so you can test your alarm regularly. Installation is simple with the versatile wall and ceiling mount and the easy slide-in mounting bracket. This alarm has a white finish, powered by 9-volt battery (included), weighs only 0.56-pounds and measures 4.92-inches long by 4.92-inches wide by .94-inches high. First Alert Maximum Protection Alarms are the newest tech creation to provide a modern safety solution in the fire safety industry. The First Alert P900 Maximum Protection Battery Powered Slim Smoke and Fire Alarm comes with a 10-year limited warranty that protects against defects in material and workmanship.