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: 4.2/5. 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.

Verdict: 4.0/5. The Kidde COB is the entry-level battery CO alarm — no display, annual AA battery replacement, portable for RVs and travel. Step up to COBD for a display, or COB10 for zero-maintenance sealed battery.

Verdict: 4.2/5. The Kidde COP is a compact AC plug-in CO alarm with AA battery backup, rotating plug, and surge protection — no digital display. Budget-friendly plug-in option; step up to COPD for a display at modest extra cost.

Verdict: 4.3/5. The Kidde COBD is the budget battery CO alarm with digital display — AA batteries replaced annually, standard UL 2034 thresholds, night chirp suppression. No low-level alerts; step up to COBDL for vulnerable occupants.

Verdict: 4.3/5. The Kidde COPD is a solid AC plug-in CO alarm with AA battery backup, digital display, rotating plug, surge protection, and night chirp suppression — a practical upgrade to the classic plug-in CO alarm form factor.

Verdict: 4.2/5. The Kidde COB10 is the budget entry into 10-year sealed battery CO protection — zero maintenance, no display. Ideal for secondary placements and hallways where a display is not required.

Verdict: 4.4/5. The Kidde COBD10 combines a sealed 10-year battery with a digital CO display — zero maintenance plus visible readings. Compare to the C3010D (functionally equivalent) on price at purchase.

Verdict: 4.3/5. The Kidde COBDL is the lowest-cost entry into low-level sub-threshold CO detection — same alert capability as the COBDL10 at lower upfront cost, with annual battery replacement.