The First Alert 1039840 Smoke Detector comes with a built-in 10-year battery and utilizes a combination of photoelectric and ionization technology to quickly detect both flaming and smoldering fires. With an easy-to-use single button operation, the detector can be silenced and tested with ease. Plus, there's no need to replace the battery during the lifetime of the detector. Installation is a breeze and requires no wiring.
1039840 features:
- Uses dual photoelectric and ionization to detect both flaming and smouldering fires
- Built-in 10-year battery
- Loud 85-decibel alarm
- A single button for testing and silencing
- no wiring required for installation