Quality assurance: 1, the project will be tested before ship, it will be in good condition, if you have some questions, feel free to contact us. 2, guarantee the 30 day, 7 days return the non-working items, in addition to the broken, the goods crashed.Cargo is wrong version buyer pay return shipping charges. 3, please confirm before ordering the item is compatible with the model.No return for incompatible problem. 4, goods not buyers pay for return shipping charges.Before buying please professional consulting, we would be the biggest sincerity to service. 5, if signed, or delete, no warranty. Feedback: 1, once you receive your project, please feedback to us, it will tell us that you have received your goods. 2, please give us a positive feedback after you receive your order, we will soon give you a positive feedback. 3, your satisfaction is the most important thing for us.If you have questions or problems about your transaction, please contact us before leaving any type of feedback.Reasonable, give us a chance to correct within a reasonable period of time, regardless of your concern.Negative feedback can't solve anything. 4, we are committed to our customers to provide the best customer service, building strong relationships with our customers, so please buy confidence. Thank you very much!