Thank you for choosing Changke Connect Products. Please read the Manual carefully before using our product. During the after-sales service period, if the product has quality issue under proper use following requirements of the Manual, please contact the after-sales service department or fill in the form “Customer Service” on our website. We will provide free maintenance, repair or other service based on the actual case. If the product does not have quality issue or it's out of the after-sales service period, Changke Connect keep the right of charging maintenance or repair service case by case, while some additional costs such as freight and inspection fee shall be borne by the customer.