On 5/14/18 6:50 AM, Robert Rose wrote:
Hello,

Are these two outfits the same ?
Don't know.

One more reliable than the other ?

Thanks,
R.

Consumer Reports has the First Alert 3120B and the Kidde PI2010
rated the same.
The Kidde is subject to recall though. Both are hardwired with battery
backup.
They rate the First Alert SA320CN and the Kidde PI9010 the same. The
Kidde is subject to recall. The second pair are battery only.
Stay away from ionization detectors. The previous four detectors
are all rated in the
upper 80s. The best ionization detectors are rated at 55.