Review on 2 Pack Battery Powered Smoke and Carbon Monoxide Detectors with Test/Reset Button by Jonathan Olson

Working. I bought them because they were a lot cheaper than the wired models they replaced. Unfortunately, they were slightly smaller than these blocks and didn't fully cover the hole that required patching the drywall. The mounting bracket didn't match the length of the electrical box, so I had to install the bracket into the box. It would be better if holes were drilled for a standard electrical box and panel. The device flashes to indicate that it is working. It's like lightning strikes your room at night. I have to cover it so I can sleep.