The ADVANTAGE 6021's Smart Logic Technology determines the ideal cuff inflation level, and controls the cuff inflation and deflation automatically. The irregular heartbeat detection of this blood pressure monitor warns you when your heartbeat is getting erratic. The ADVANTAGE 6021 features a recall of the last ninety-nine readings, with date and time stamp. This feature is useful for those monitoring their blood pressure everyday. The ADVANTAGE 6021 has an integrated cuff storage compartment. This blood pressure monitor runs on four AA batteries, and an AC adapter is available as an optional add-on. With an 8.7 inch to 12.6 inch cuff circumference, this blood pressure monitor is for use by adults. The ADC ADVANTAGE 6021 blood pressure monitor comes with a five year warranty.