First Alert® DC10-500 One Link Smoke & Carbon Monoxide Detector Alarm, WhiteIts protection at its finest. New slim design adds an element of style to safety. Half the size of the standard alarm with all the protection needed to keep what matters most safe and secure. App allows you to check history of alarms & monitor CO2 levels. You will be alerted to the type & location of danger & can call 911 directly from the app. Color: White Equipped with 2 "AA" batteries App allows you to check history of alarms & monitor CO2 levels