Please tell me the name of this wonderful unit and why it is needed in a scooter.

 
Please tell me the name of this wonderful unit and why it is needed in a scooter. - Chinese, Scooter, Details
Please tell me the name of this wonderful unit and why it is needed in a scooter. - Chinese, Scooter, Details
Please tell me the name of this wonderful unit and why it is needed in a scooter. - Chinese, Scooter, Details


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