Kidde i12060 Hardwire with Front Load Battery Backup Smoke Alarm, 1 Pack, White

From the Manufacturer

There are only minutes to escape a house fire. The sooner you hear the smoke alarm, the sooner you can get out safely. Kidde interconnected Ionization smoke alarms provide early warning against fire by linking together the smoke alarms in your home, dramatically increasing your ability to hear an alarm anywhere, regardless of where the fire starts. This unit is an ionization smoke alarm that operates on a 120V power source with 9V battery backup. The front load battery operation speeds installation and reduces battery replacement time and effort by eliminating the need to remove the alarm from the ceiling. Install UL listed smoke alarms on every floor of your home, in hallways, inside bedrooms and outside of sleeping areas. This model also includes a Hush feature, which allows you to quickly silence nuisance alarms. Replace smoke alarms every 10 years. Ionization sensing alarms may detect invisible fire particles (associated with fast flaming fires) sooner than Photoelectric alarms. Studies show both types will effectively detect either type of fire. For optimal protection, install both smoke alarm technologies in your home.