Kidde KN-COB-B-LS Nighthawk Battery Operated Carbon Monoxide AlarmKidde KN COB B LS KN COB B LS Product Description The Nighthawk KN COB B LP battery operated carbon monoxide alarm is an easy to install unit that provides reliable protection against the dangers of carbon monoxide. Written information and instruction make this unit's operation easy for anyone to understand. The Nighthawk DC Basic alarm has a small sleek design that is suitable for all living areas and has a 10 year limited warranty. 10 Year Life: If