All products are delivered in bulk or semi-bulk. It is up to the customer to assemble it by him/herself. We can provide customers with assembly video or remote guidance, and we can also send assembly instructions to customers. If the customer does not have the ability to assemble by himself, please be careful to purchase. If the vehicle cannot be used because the customer does not have the ability to assemble it, this is not a product quality problem and our company will not take any responsibility. If the customer entrusts a professional to assemble the vehicle, the costs incurred will be borne by the customer, and the company has nothing to do with any man-made damages that occur during the assembly process or cause the vehicle to be unusable. All products will be tested before shipment, after qualified to the customer to confirm that there is no error, and then shipped. Due to the transport distance. If the quality problem does lead to customer returns, the transport costs involved, borne by the customer. Please read carefully before purchasing, all confirmed purchases are considered to be the customer's agreement to the above agreement. The agreement has the same legal effect as the purchase contract.