Our Patient Aid Upper Arm Electronic Blood Pressure Monitor (PABPMB) is an easy-to-use medical device that accurately measures a patient’s pulse rate, diastolic and systolic blood pressure. Just wrap the BP cuff around the person’s upper arm and press the START button to get a reading. Using an oscillometric method, the BP machine takes precise measurements automatically. No stethoscope needed. The device is equipped with an internal memory that records up to 90 readings each for 1 or 2 patients. The oldest reading will be replaced first, once this limit is reached. This BP monitor is powered by 4 AAA batteries or an AC adapter. A set of batteries can power up to 300 hundred readings. Be sure to read the instruction manual to learn the proper way of setting up and using your blood pressure machine.