1. Check the appearance, see Paint, plating surface is intact.
2. According to the actual operation of the manual, check the entire vehicle's working status. Speed transition should be smooth, start without impact, wheel rotation should be flexible, no lag heavy sense, wheel rotation sound soft, no noise, the brakes should be moderately tight, braking reliable.
3. Also check that the model should be the auxiliary functions (such as electricity display, speed, mileage display, etc.) is in the normal state.
4. With the supporting accessories, chargers, certificates, manuals, warranty card is complete.