The Kidde KN-COPP-3 AC powered, plug in carbon monoxide alarm provides you and your family with warning signal to protect against dangerous levels of carbon monoxide in your home. This alarm is easily installed in any of your AC wall outlets. The digital display feature allows for easy viewing of carbon monoxide levels from 30-999PPM (parts per million). The KN-COPP-3 is UL listed and offers a 10-year life and a 10-year limited warranty.