Advanced accuracy: Our most precise home blood pressure monitor ever, to help ensure consistent, precise readings. Wide-range cuff: Contoured cuff design wraps the arm for more comfortable measurement. Fits standard and large adult arm circumferences from 9" to 17" (22 cm to 42 cm). One-touch use: Easy one-touch operation allows home blood pressure monitoring that is both simple and accurate. Irregular heartbeat detector detects irregular heartbeats while your blood pressure is being measured. 14 memory storage allows you to review the last 14 readings with a touch of a button. Clinically proven accurate. Operates on 4 AA batteries (not included). Contains: 1 digital automatic blood pressure monitor, 1 wide-range cuff (fits arms 9" to 17" in circumference), 1 illustrated English/Spanish instruction manual, 1 quick start guide.