Our wrist blood pressure monitor is backlit, so you can see the ers on the screen even in a dark environment, which is very convenient for the elderly. We have improved the wrist blood pressure monitor and it is now rechargeable, eliminating the need to buy batteries. To check your blood pressure status at any time, we highly recommend our wrist blood pressure cuff. Small size, light weight, easy to use, low noise, suitable for family self-test or travel measurement. HOW DOES IT WORK: For more accuracy, please follow the steps below to use the wrist blood pressure monitor: 1.Before measurement, please relax for about 5-10 minutes and avoid eating, drinking alcohol, smoking and bathing within 30 minutes; 2.Roll up your eeve and make sure it's not too tight, remove your watch or other wrist decorations; 3.Wrap your wrist inside the eeve, make sure the screen is facing up and toward your face; 4.Please sit on a chair and have an upright body posture, keep the device at the same level as your heart, and then start measuring. Please do not crouch or cross your legs or speak until it is complete; 5.Read the measured readings and check your BP by referring to the rating indicator; PERFORMING A READING: Press the "Power" button. Press the "Start" button. Use an average of 2 readings. Wait a couple of minutes between readings. Wait 5 minutes to take more readings if your blood pressure seems high. WHAT VALUES ARE NORMAL? DIA =110 or SYS >= 180 Severe hypertension