First Alert is a reliable name when it comes to home safety, so you can rest assured that the First Alert SA303CN3 Battery Powered Ionization Smoke Alarm is a high-quality product. This smoke alarm features an ionization sensor for detecting smoke, as well as a loud 85-decibel alarm to alert you in case of a fire. The ionization sensor is effective in detecting smoke from flaming fires, such as paper and grease fires. This is a battery-powered smoke alarm, so it's easy to install and doesn't require any wiring. The First Alert SA303CN3 is a great choice for any home.