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First Alert Ionization Smoke Detectors feature an ionization sensor that provides the earliest possible warning to fast flaming fires. Ionization sensors are optimized to detect fast flaming fires that can be caused by paper, kitchen grease and other fast-combusting materials. All First Alert Hardwired Ionization Smoke Alarms come equipped with a battery backup that ensures continued operation in the event of a power outage.
First Alert Combination Alarms that implement ionization sensors offer dual protection from smoke and carbon monoxide. Create a smoke, fire and carbon monoxide defense system by interconnecting First Alert Hardwired Smoke Alarms with one another. Battery operated ionization smoke detectors are also available and provide plenty of versatility when it comes to the installation process.
Where to Place Ionization Smoke Alarms: One in every bedroom, and at least one on every level of the home.