Designed to help protect you and your family from the dangers of smoke and fire, the Kidde i9040 Fire Sentry Compact Smoke and Fire Alarm, Ionization Sensor is a compact, battery-operated unit that provides continuous protection, even during power outages. UL-listed, it uses ionization technology to detect smoke and fires as soon as they start, providing both extra escape time and peace of mind.i9040 Fire Sentry Compact Smoke and Fire Alarm At a Glance:Battery-operated alarm offers continual operation, even during power outagesProtects your family in case of a home fireUses ionization technology to detect even invisible fire particlesIncludes 9-volt batteryThree-year limited warranty Each alarm provides a range of user-friendly features for easy operation and maintenance. View larger. Use the test button to check the alarm"s circuitry, horn, and battery function. View larger.Smoke Alarms Prevent Home Fire Deaths Every year, 70 percent of all home fire deaths occur in homes with no alarms or no working alarms, while nearly one quarter of smoke alarms in reported fires are not working. Installing smoke alarms like the i9040 in your home can provide reliable protection in case of fire. And because the i9040 offers several user-friendly features, you"ll always know when it"s working properly, and when the batteries need to be replaced.Compact Unit Provides Protection Against Home Fires Measuring just four inches in diameter, the i9040 is smaller and more discrete than traditional smoke alarms, which makes it an ideal choice for smaller spaces or for blending in with your decor. It installs quickly without wires, and includes a test button that allows you to periodically check the circuitry, horn, and battery function. Also, a chirping sound makes it clear when it"s time to replace the battery.Ionization Sensor Technology To ensure early detection of fires, the i9040 use ionization sensing technology Ionization sensing alarms may detect invisible fire particles (associated with fast flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible fire particles (associated with slow smoldering fires) sooner than ionization alarms. Kidde strongly recommends that both ionization and photoelectric smoke alarms be installed to help insure maximum detection of the various types of fires that can occur within the home.Compliancy and Warranty Information The i9040 alarm is UL listed and is backed by a three-year limited warranty.About Kidde: A UTC Fire and Security Brand Renowned for global leadership in fire detection and suppression, Kidde provides solutions ranging from portable fire extinguishers to advanced industrial controls such as flame detection and explosion suppression systems. Kidde is a UTC Fire and Security brand, with a history that"s rich with innovations, from the patent of the Chubb Detector Lock in 1818 to the development of the world"s first wireless networked smoke detectors in 2004.What"s in the Box Kidde i9040 Smoke and Fire Alarm, 9-volt battery, mounting hardware, and installation guide. Keep your family safe by placing alarms and extinguishers in each area of the house, and by having a fire escape plan. Click here for a detailed image.