Product Description The Kidde Smoke Detector, Battery Powered, model i9050, features ionization sensor technology to protect you & your family from the dangers of smoke & fire. Operating on a 9-volt alkaline battery, the smoke alarm provides continuous protection from smoke or fire, even during power outages. To ensure proper installation, the test/silence button will electronically simulate the presence of smoke and cause the unit to alarm. After 10 years, the smoke alarm will need to be disposed & replaced. UL Certified with a 10-year limited warranty. Meets requirements of UL217, NFPA72, The State of California Fire Marshall, NFPA 101, FHA, & HUD. Amazon.com The battery-powered Kidde i9050 ionization smoke alarm is designed to protect you and your family from the dangers of smoke and fire. This basic smoke alarm is easy to install throughout your home, and it's powered by a 9-volt battery (included). This version comes as a single, but it's also available as a twin pack. Kidde i9050 Includes 9-volt battery. At a Glance i9050 Battery-Operated Basic Smoke Alarm At a Glance: Easy installation--no wiring required Powered by 9-volt battery for continuous protection even during power failures Flashing LED shows alarm is receiving power Low-battery indicator 10-year limited warranty At a Glance Features This basic battery-operated smoke alarm is powered by a 9-volt battery (included), providing continuous protection even during power outages. It includes a flashing red LED to indicate the alarm is receiving power as well as a test button to verify the unit's electronic circuitry, horn, and battery functions are working properly. During a smoke incident, a piezo-electric horn (rated at 85 decibels at 10 feet) will sound in a repetitive manner--three beeps, a pause, three beeps, a pause. It also offers a low-battery warning and a tamper-resistant feature that deters removal of the unit from the wall or ceiling. It's backed by a 10-year limited warranty. The Kidde i9050 smoke alarm uses ionization sensing technology, which generally detects invisible fire particles (associated with flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible particles (associated with smoldering fires) sooner than ionization alarms. Kidde recommends that both ionization and photoelectric smoke alarms be installed to insure maximum detection. What's in the Box One Kidde i9050 Battery-Operated Basic Smoke Alarm, one 9-volt battery, and operating instructions. Kidde i9050