The Kidde Plug-In, AA Battery Backup Carbon Monoxide Detector, Explosive Gas, Easy-to-Read Digital Backlit Display, Model COPDLG is the ideal solution for homeowners that want to help make their families safer by detecting explosive gas and carbon monoxide gas. An explosive gas is a flammable gas such as methane, propane, or hydrogen that can ignite quickly. Carbon monoxide is a deadly gas that's invisible, odorless and disperses evenly throughout the air. Major sources are fuel-burning appliances, like gas stoves, water heaters, furnaces and fireplaces.* Because carbon monoxide is a colorless, odorless gas, dependable detection is crucial and this compact CO detector can be enabled quickly in any room of your home. This Kidde carbon monoxide detector alarm features easy plug-in installation and two AA alkaline backup batteries (included) with no wiring required. An advanced electrochemical sensor detects dangerous levels of CO. When carbon monoxide, natural gas, or propane is detected, a loud 85 dB alarm sounds alerting you to evacuate outside to fresh air. Event level memory keeps track of CO incidents. The test-hush button allows you to test the battery functioning as well as temporarily silence the low battery chirp warning. Place a CO alarm on every level and outside each sleeping area. UL Certified with a 10-year limited manufacturer's warranty.*Children, elderly adults and pets are more vulnerable to low levels of carbon monoxide and may be affected faster.