I've always had a blood pressure problem. But I'm impatient to make an appointment with the doctor and go to the queue. When I saw this monitor online, I thought of the online doctor online service. As long as at home monitoring data to the doctors, they give me prescription drugs, which is much more convenient. After I bought it, I tested it, which is not much different from the data measured by the doctor. It's accurate. After receiving it, it was found that the volume was really small and easy to carry. Highly recommended.