This Wrist-Type Blood Pressure Monitoring Unit is easy to use and maintain. It's compact and highly portable. It operates using 2 AAA batteries and has an automatic shut-off feature that saves battery life. The easy-to-read LCD digital display shows systolic (top number), diastolic (bottom number) and pulse rate. The onboard memory holds up to 120 check results. This unit is FDA approved and meets or exceeds AAMI clinical validation standards.