Cuff of this Digital Blood Pressure Monitor is wrapped around the upper arm and inflated by squeezing a rubber bulb with the hand. Each device is designed with a large and high-resolution digital readout display for effortless reading. Providing more accurate blood pressure readings, the provided device is convenient to use than an aneroid unit. Whenever you use this device, make sure that arm should be relaxed and rest for five minutes before taking readings. You same arm for reading blood pressure as each arm will provide different blood pressure readings. Before 30 minutes of test with this Digital Blood Pressure Monitor.