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

I bought two boxes and that's four alarms in total. I installed the first three very easily, after installing the mounting bracket in the ceiling (molly bolts in drywall, screws inside) I removed the tab to activate the alarm battery. Vain. I took out the three batteries that came with it and replaced them with three new batteries, but they didn't work. It comes in a box of two, I already have one installed and ready to go and honestly I won't be taking it. down once only to be sent back broken. Lesson learned: test the device first BEFORE you start the installation.