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

Please read and understand. When buying, pay attention to the date of manufacture. I need to read the reviews in detail. I bought 3 packs, one of them squeaked (5 beeps - end of life) 1 month after installation and also after the return period. I looked at the date of manufacture and it's November 2010. I'll throw them all away, it's ok except it happens in the middle of the night. PLEASE check these before the return period expires. David