WRISTECH Blood pressure monitor -Wrist-With Irregular Heartbeat Detector Product Features Extra-large LCD screen! Fully automatic monitor has easy one-button operation. Displays your systolic and diastolic pressure, pulse rate, date and time. Also has irregular heartbeat indicator. Storage case included. Uses 2 "AAA" batteries, not included. Fits wrist circumferences approx. 5.3in to 7.7in.