First Alert 0827B Ionization Smoke Alarm with 10-Year Sealed Tamper-Proof Battery , White , Pack of 1Brand: First Alert Color: White Features: 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 Alarm also features loud 85 decibel alarm, easy mounting bracket, a