This Upper Arm Style Blood Pressure Monitoring Unit is simple to use and easy to maintain. It is compact and portable, making it ideal for home or travel use. It operates using 4 AA batteries and has an automatic shut-off feature that saves battery life. There is an easy-to-read LCD digital display that shows systolic (top number), diastolic (bottom number), and pulse rate. The unit's memory holds up to 120 check results. This monitor uses the Oscillometric Method of determining blood pressure.