This Apollo smoke and carbon monoxide detector is a reliable unit that will keep your home safe. It is designed to detect both smoke and carbon monoxide to ensure that you and your family are alerted in case of any dangerous situations. The detector runs on batteries and will need 2 batteries to function. It is white in color and comes in a unit quantity of 4. This unit is perfect for those who value safety in their home. It is manufactured by a trusted brand, Apollo, and has a model number of Apollo 51000-601. The detector is sold with batteries included. It is a great addition to any home security system and will provide you with peace of mind.