* Low Profile AC/DC powered unit that operates on a 120V power source. * The sealed-in rechargeable battery backup lasts the 7-year life of the alarm to provide a maintenance free design. * The digital display feature allows for easy viewing of carbon monoxide levels from 30-999PPM. * Easy installation with this innovative, low profile design fits in most standard 2-gang, metal or plastic electrical boxes. * Peak level memory button displays the highest CO level measured since the last reset. * 7-Year End of life warning – Alerts user to replace CO alarm after 7-years of operation.