1. Adjust the buckle as well as the stretchable connector to get your best fit.
2. Keep your back straight, then long press the switch for 3 seconds to power on the reminder.
3. Keep your back straight until the reminder vibrates 2 times,that means it has recorded your correct posture.
4. When you have a hunchback bends more than 25 degrees.
5. The reminder will automatically detect it and trigger vibration to remind you.
6. Long press the switch for 3 second to power off the device.