1. Sit quietly for 10 minutes before measuring. 2. Sit upright with your arms and heart level. 3. Do not move your arm during the measurement, stay relaxed during the measurement, and do not talk. 4. Plug in the cuff and make sure it's in the right direction (crucial) 5. Press the middle measurement button once to display the automatic measurement in full screen. 6. During the measurement process, increase the pressure first and then decrease the pressure. 7. At the end of measurement, display high pressure, low pressure and pulse value. 8. When shutting down, press M button for memory query. 9. Can use battery, or usb power supply (can use the charger of the phone) 10. If the measurement process encounters interference, you can rest for 3 minutes and then measure again.