The First Alert SA350B is a smoke alarm with a 10year lithium battery. After 10years, just replace the First Alert smoke alarm and you're excellent to go. Of course, it comes conventional with its highly trustworthy 10year lithium battery and is UL listed.
- Part No.: SA350B
- Battery Type: Sealed-In Lithium
- Depth: 2 in.
- Diameter: 5.6 in.