The Microlife Advanced Automatic Blood Pressure Monitor meets these American Heart Association recommendations for home blood pressure monitors: third party validations for accuracy and the ability to store readings and share them to your doctor. Medical Grade Accuracy: Microlife blood pressure monitors deliver the highest standards of accuracy from BHS and DABL, the world's leading authorities for accurate blood pressure measurement. Irregular Heartbeat Detection: This patented feature detects the appearance of an irregular heartbeat during measurement and gives a warning signal with your reading, while still providing an accurate blood pressure measurement. Automatically stores 99 readings with time and date. Large, easy to read tilted display. Includes 4 AA batteries. Includes Medium cuff (fits arms 9.25" - 13.25") and Large cuff fits arms 12" - 16". Includes AC Adapter. 5 Year warranty. Includes zippered storage case.