Review on 🔋 2-Pack Battery Operated FIRST ALERT CO400 Carbon Monoxide Detector - No Outlet Required by Isaac Shankar

Like many others, this carbon monoxide alarm only lasted a few months before failing (3 beeps in the middle of the night indicate a malfunction). Replacing the battery seemed to fix the problem for a few weeks, but the problem reappeared somewhat randomly. Worse, we had a real problem when our heater exhaust came loose; The alarm clock may have squeaked, but we're used to ignoring it and just cleaning it in another room for a while. The craftsmen said we were lucky to be alive.