First Alert CO400CN2 Alarm Twin Pack, Carbon Monoxide, Aa Battery, Plastic Housing, 9.3 In L X 6.1 In W X 4.1 In H

Product Features

• Modern, compact design with no installation required
• Electrochemical sensor - the most accurate technology available
• Simple to use silence/test button; low battery warning; end-of-life timer
• Loud 85-decibel alarm
• Convenient front battery access for easy replacement