Advanced Positioning Sensor automatically confirms the monitor is at heart level, ensuring an accurate reading. This monitor is easy to use and not only provides systolic/diastolic and pulse readings, but also advanced diagnostics such as an irregular heartbeat detector and an average of the last three blood pressure readings. With simple, silent and one-touch operation, an accurate and reliable blood pressure measurement is seconds away. Cuff fits wrist sized 5 1/4" to 8 1/2" in circumference.