The Kidde K7DCO carbon monoxide alarm, is a new model to replace the Kidde 7DCO that features a digital readout display for continuous monitoring of CO levels. Peak Level Memory lets you recall the highest CO level recorded since last reset. As an upgrade from the 7DCO, the improved green credentials of the K7DCO reduce the required number of replaceable alkaline batteries to 2 x AA cells (supplied). Despite this upgrade, the K7DCO is compatible with the 7DCO baseplate and can still be left freestanding or wall mounted. Kitemark approved for use in the home and while travelling – camping, caravans, and boats. Suitable for home or travel, including in caravans and boats Product Life: 10 years Battery: 2 x replaceable AA alkaline batteries (included) Warranty: 10 year warranty Digital display provides several readings: Current CO level Peak CO level since last reset – 11ppm to 999ppm Low battery warning (in addition to an audible "chirp") End-of-life warning after 10 years Test/Reset