CLINICALLY ACCURATE - Easy Operation, Advanced Accuracy, No Calibration Required--One key Start/Stop measurement LARGE DISPLAY - The large, oversized numbers make reading the results from this upper arm blood pressure monitoring system. STORE YOUR READINGS - With the built-in memory function you can recall the last 120 readings for 2 users. FDA approved, American Heart Association (AHA) color indicator guidelines for ease of use. Powered by 4 AA batteries, and convenient carrying case for home and travel use. 100% CUSTOMER SATISFACTION.