First Alert 0827B Ionization Smoke Alarm with 10-Year Sealed Tamper-Proof Battery , White

Complies with all current 10-year legislation in U.S. states/cities where required
Alarm features an ionization sensor for smoke detection, which is effective in recognizing smoke from flaming fires such as paper and grease fires
Battery-operated unit provides continuous monitoring even if there’s a power failure: Plus, it’s easy to install