We provide standardized and customer-oriented return and exchange services for all electric bicycle, water bottle and cup holder products, offering a 30-calendar-day return and exchange window calculated from the official order delivery date. To qualify for return or exchange, all submitted items must remain completely unused, unassembled, unridden, unwashed, unmodified and undamaged, retaining original brand-new conditions without any usage traces, surface stains, artificial damage or structural deformation. All original factory packaging, protective films, shockproof foam, outer cartons, matching accessories, installation parts and instructional manuals must be fully intact without loss or damage. Custom personalized modified products, specially customized size accessories and final sale clearance goods are strictly non-returnable and non-exchangeable due to customized attributes and special sales regulations. As electric mobility equipment and daily hygiene accessories with strict secondary sales standards, any products that have been assembled, ridden, used, cleaned, stained, artificially damaged, privately modified or improperly stored are ineligible for return and exchange. Electric bikes with riding wear, electrical system abnormalities and surface scratches, water bottles with internal dirt, sealing damage and usage traces, and cup holders with structural looseness and extrusion deformation will be rejected for return applications to guarantee unified product quality and fair shopping experience for all customers. To initiate a return or exchange request, customers must submit an application through the official website portal with a valid order number and detailed problem description. After professional team review and approval, customers will receive an official return authorization number and standardized return shipping guidelines. Customers are fully responsible for all return shipping fees and transportation risks unless the products have factory defects, confirmed transit damage, warehouse shipping errors or missing factory accessories attributable to our team. We strongly recommend using trackable logistics services and completely restoring original shockproof and waterproof packaging during return shipment to prevent secondary damage which will invalidate return qualifications. After we receive, inspect and confirm the returned products fully comply with official return standards, we will process refunds or store credit exchanges within three to five business days. All refunds will be returned through the original payment channel, and the specific arrival time depends on the processing efficiency of the corresponding payment institution. Direct exchanges for different colors, sizes or styles are not supported; qualified returned products can only be converted into store credits for new purchases. For unresolved return and exchange questions, customers can check the official FAQ page for detailed professional guidance and after-sales support services.