Keep your home and family safe and secure with this Kidde Fire Sentry Smoke Alarm. It features a low profile and discreet design with state of the art protection technology from Fire Sentry and it is powered by a 9V battery that keeps working even when power to your home is interrupted. This white smoke alarm has a low-battery indicator so that you know when it s time to replace its batteries before it ceases to function. It also includes easy-to-follow installation instructions