First and for most, we have a experienced purchasing team who always do their best to find the best suppliers in the market, and in the most generals case, they buy from the franchised distributors to make sure the product’s quality from the very beginning. Then, when we get the products from the supplier, there is precise instrument in our company, our quality control staff will check the parts following the QC procedure to guarantee the parts is original before we ship it to the customer. At last, there are some cooperative test houses which can provide professional test service to the parts if need be.