Product Reviews

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: 4.2/5. The Kidde KN-COPP-3 Nighthawk is the right plug-in CO alarm when you need a proven AC-powered unit with digital display and Kidde’s Nighthawk platform — the wrong one when battery backup during power outages is a priority.