In alt.home.repair, on Wed, 4 Jul 2018 12:01:18 -0600, rbowman
wrote:

On 07/04/2018 10:03 AM, micky wrote:
Wade, it's a 110 volt smoke alarm. I forget what that says about it.

That says you'll need to unplug it rather than just take the batteries
out. Does it have batteries? It would seem a smoke alarm that required
110 might not be too good at detecting electrical fires.

One should have both. The 110 volt ones work differently from the
battery operated ones, and one is better at smouldering fires and the
other is better at the other kind.

But even with an electrical fire, it usually takes longer to cut the
power to the house than it takes for the smoke alarm to go off. Just
like even when your car goes into the lake and under the water, you can
still probalby open the power windows if you act quickly.