Product Reviews

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: 4.4/5. The Kidde COPDLG is the most capable dual CO and explosive gas alarm — adds low-level CO alerts, AA battery backup, and night chirp suppression over the predecessor KN-COEG-3.

Verdict: 4.3/5. The Kidde KN-COEG-3 delivers dual CO and explosive gas protection in one plug-in unit with a digital display — the right choice for homes with natural gas or propane appliances where both hazards need coverage.