Granzia Alteza Digital Blood Pressure Monitor Product Specifications: Offers easy portability and storage. Operates on a USB cable (included) or 4 AAA batteries. Large display for easy reading. Saves readings for 2 users and provides the average of the last 3 readings. Memory capacity: 180 readings (90 readings per user). Measures blood pressure quickly and accurately. One control button. What preparations should you make when measuring your blood pressure? Before measuring your blood pressure: Do not eat, smoke, or exercise for at least 30 minutes. Do not use any medications that can raise blood pressure. Rest for at least 5 minutes before taking the reading. Sit in a comfortable position with both feet flat on the floor. Do not move or talk while measuring your blood pressure. Try not to measure your blood pressure if you are stressed or upset. If possible, use the same arm for each reading. Readings may differ by 10 to 20 mmHg between arms. Remember that blood pressure readings vary throughout the day. They are usually highest in the morning after you wake up and move around. They decrease during the day and are at their lowest in the evening.