Although you may notice the first few times the cuff inflates, you will soon become used to the monitor. Most people find them very easy to wear. Most ambulatory blood pressure monitors use either what's called an ausculatory method or an oscillomtetric method. Blood pressure sounds are determined by the ausculatory method that uses microphones under the blood pressure cuff. The oscillometric method involves measuring movement of the blood after closing off the brachial artery, the main artery that runs from the shoulder down to the elbow.
Some devices use both methods.
The data is stored and then interpreted by trained professionals in your doctor's office.