description carbon monoxide alarm, battery operated the first alert co400 carbon monoxide alarm utilizes an electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. this carbon monoxide detector is battery operated, making it portable and easy to use anywhere, even in the event of a power outage. when carbon monoxide levels become elevated, a loud 85-decibel alarm alerts you to the threat. california proposition 65 warning. features co detector alerts you to carbon monoxide battery-operated design works almost anywhere loud 85-decibel alarm sounds when co levels are detected single test/silence button for simple operation specifications acme tools brand name first alert acme tools part number 1039718 assembled depth (in) 3.4 assembled height (in) 5 assembled weight (lbs) .7 assembled width (in) 1.5 california proposition 65 warning required yes country of origin mexico globaltradeitemnumber (gtin) 00029054018304 height (in) 5 package contents detector, owner's manual, battery and hardware package depth 5 package height 6.5 package weight 2.5 package weight (lbs) 2.5 upc 029054018304