FIRST ALERT LED CARBON MONOXIDE ALARM, BATTERY-OPERATED

Battery-operated carbon monoxide alarm with a digital display. Easy to use and protects your family by detecting the carbon monoxide you can't see, smell, or taste in the air. The alarm uses an electrochemical carbon monoxide sensor, and the easy-to-read backlit digital LED display communicates a clear readout of current carbon monoxide concentrations in parts per million. Battery backup provides peace of mind during power outages. The test/silence button both silences a non-threatening alarm and low battery warning and allows you to test the unit's functionality. Comes with 1 carbon monoxide alarm, a user's manual, and "AA" batteries.