1.How will you guarantee the quality? We will test and send testing video to buyer confirm before shipping. 2.When will you ship the order? Once we get confirmation of payment,we will try our best to ship within 48 hours. 3.How can I track my order? Once your order in shipped,we will e-mail you shipping details. 4.If I was not satisfied with the products,can i return goods? Yes,we offer exchange and repair service in the warranty time.5.How do you make our business long-term and good relationship? a. We keep good quality and competitive price to ensure our customers benefit ; b. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.