First Alert SA304CN3 Smoke Alarm with Escape Light Help keep your family safe with this battery-operated smoke alarm that includes a light to illuminate an escape path in the event of an emergency Alarm features an ionization sensor for smoke detection and is effective in recognizing smoke from flaming fires such as paper and grease fires; a loud 85-decibel alarm sounds when smoke levels are elevated Also features a single test/silence button and EZ-Access battery door Includes 9V battery; use Polaroid 9V batteries for best results or a lithium 9V battery for longer service life To ensure complete protection make sure to place one on each level of your home and in each bedroom Ionization battery-operated smoke alarm with escape light Features convenient silence/test button, blinking power light, 85-decibel alarm Also includes side battery drawer and missing battery guard Low battery warning and tamper resistant 9-volt battery included; 10-year limited warranty