Product Reviews

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: 4.0/5. 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: 4.2/5. The Kidde KN-COPP-B-LP is the Nighthawk-branded low-profile battery plug-in CO alarm — same electrochemical sensor and digital display as the standard KN-COPP-B in a slimmer housing for tighter outlet clearance situations.

In-depth review of the Kidde KN-COP-DP-LS Nighthawk AC plug-in carbon monoxide alarm with digital display — no battery backup.

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.