The Nighthawk, AC Powered, Plug In Carbon Monoxide Alarm With Battery Back Up Pallet, Easy To Install, Provides Reliable Protection Against The Dangers Of Carbon Monoxide, Written Information & Instruction, Easy For Anyone To Understand, Ac/Dc Digital Alarm Has A Small Sleek Design That Is Suitable For All Living Areas, 7 Year Limited Warranty, Contains 24 Each, Open Stock TV #113-409, UPC: 0 47871 07308 5.