Product Reviews

Verdict: 4.3/5. The First Alert CO615 plug-in CO alarm features a 6-foot power cord for flexible placement, 2 AA battery backup, and a backlit digital PPM display. Best plug-in CO alarm in the First Alert lineup for standalone use. UL 2034 listed.

Verdict: 4.4/5. The First Alert CO710 is the premium sealed-battery CO alarm — 10-year sealed lithium, digital display showing PPM + room temperature, freestanding portable design, and a 10-year warranty. Zero maintenance, real-time CO monitoring. No interconnect.