Comes with AC power adapter. It allows users to keep track of their blood pressure more effectively with a built-in 12 hour clock and alarm that can be set to go off three times as a reminder to take readings. A time and date stamp helps keep track of measurements. The “Easy Cuff” readily conforms to the shape of upper arm for a quick and proper fit. Cuff size 9"–17" (23-43cm). AC Adapter included, AA batteries not included.