Product Reviews

Verdict: 4.0/5. The Kidde KN-COB-LP2 is a compact battery CO alarm with no display — reliable UL 2034 protection at budget pricing. Best for secondary placements, RVs, and emergency kits. Step up to KN-COB-B-LP for a display.

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.