Product Reviews

Verdict: 4.3/5. The First Alert CO410 is a battery CO alarm with a digital PPM display and peak memory - the pick when you want to see and track carbon-monoxide levels.

Verdict: 4.2/5. The First Alert GCO1 is a plug-in combination CO and explosive-gas (methane/propane) alarm - dual-sensor coverage for homes with gas appliances.

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.

Verdict: 4.3/5. The Kidde COPDW is the entry-level smart WiFi CO alarm — real-time smartphone CO alerts, backlit digital display, AA battery backup, and rotating plug. CO-only monitoring; step up to COPDLQW for air quality + low-level CO alerts.

Verdict: 4.2/5. The Kidde KN-COPP-3 is a plug-in CO alarm with battery backup, digital display, and peak level memory for diagnosing intermittent CO events. Compare with COPD at purchase — COPD adds rotating plug and surge protection.

Verdict: 4.3/5. The Kidde KN-COB-DP2 is the correct residential upgrade over the AC-only KN-COB-DP-LS — 9V battery backup maintains CO detection during outages. Digital display, peak memory, UL 2034 listed.

Verdict: 4.2/5. The Kidde Nighthawk KN-COB-B-LP is a battery CO alarm with digital display from the professional Nighthawk line. Real-time ppm display, peak memory, end-of-life alert. Annual battery; UL 2034 listed.

Verdict: 4.2/5. The Kidde KN-COB-B-LPM is a portable battery CO alarm with digital ppm display — ideal for construction sites, temporary facilities, and rental properties. Annual battery; standard UL 2034 thresholds.

Verdict: 4.1/5. The Kidde KN-COB-LCB-A is a plug-in CO alarm with digital display and end-of-life notification — no battery backup. Best for commercial, office, and institutional spaces on reliable circuits. For residential use, choose the KN-COB-DP2 or COPD.

Verdict: 4.0/5. The Kidde Nighthawk KN-COB-DP-LS is a plug-in CO alarm with digital display but no battery backup — suitable for commercial and rental use on always-powered circuits. For residential use, choose the KN-COB-DP2 or COPD for outage protection.

Verdict: 4.3/5. The Kidde KN-COU-B detects CO below standard UL 2034 thresholds — ideal for vulnerable occupants, healthcare, and occupational safety monitoring. Digital ppm display with peak memory. Best as supplemental monitor alongside standard alarms.