First Alert 9120B Hardwired Smoke Alarm
First Alert
The smoke alarm that chirped until you took the battery out — First Alert 9120B Hardwired Smoke Alarm
The unit on the ceiling is older than the lease. It chirps at 2 a.m. You pull the battery and tell yourself you will deal with it later.
Transcript
The smoke alarm that chirped until you took the battery out. The unit on the ceiling is older than the lease. It chirps at 2 a.m. You pull the battery and tell yourself you will deal with it later. If the house has hardwired smoke, replace like-for-like and keep the backup battery in. This listing is smoke-only — pair a separate CO alarm if you burn gas.
The problem
The unit on the ceiling is older than the lease. It chirps at 2 a.m. You pull the battery and tell yourself you will deal with it later.
Why it made the verdict
9120B is the hardwired ionization alarm with 9-volt backup that replaces the forgotten detector without a smart-home project. Interconnectable if the house is already wired for it.
Our verdict
If the house has hardwired smoke, replace like-for-like and keep the backup battery in. This listing is smoke-only — pair a separate CO alarm if you burn gas.
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