High Accuracy Blood Pressure & Arrhythmia Detecting: The Blood Pressure Monitor is sensitive enough to track heartbeat failures that might go unnoticed by you. Adjustable Upper Arm BP Cuff Monitor : Soft wide range of 22-42cm/ 8.7-16.5 inch circumference for people of different arm size, bring comfortable experience of usage. One Button Operation: just press "Start" button to measure your blood pressure and heart rate in 30 second. Extra Large LCD Backlit Display：Large high definition backlit LCD display screen and large fonts can easily and clearly show the readings even at nighttime. Advanced Two-User Memory: 90 memory x 2 users mode can recall the last 90 groups of readings for independent dual users.