Hypertension is associated with various health conditions, including coronary heart disease and other cardiovascular diseases, and must be closely monitored. The cuff should comfortably fit the arms of most adults, with a circumference of 9 inches to 17 inches. The cuff should be securely installed in the appropriate position to obtain more accurate readings. 1. Avoid vigorous physical activity before measurement to prevent readings from being too high. 2. Before measurement, ensure that the cuff is located 2 inches above the bend of the arm to avoid affecting the reading. 3. When measuring, try to maintain a sitting position and align your arms and heart at the same level. It is recommended not to wear thick clothes as this may result in inaccurate measurements. Providing accurate visual aids can be helpful for proper use. 4. Different testing times 5. After receiving the product, please test whether the battery is charged. Attention: This product comes with a regular battery and cannot be charged. If the battery is empty, please replace it with a new one. In addition, you can also connect directly to the power source using a USB cable. 6. If the button does not respond, press and hold the start button for 3 seconds to restart the product.