My car was refitted in Binzhou, Dong Jun, which is very professional. As far as we know, Dong Jun Car Audio in Binzhou is the general agent of Dana in Binzhou, and the price of genuine Dana is the national unified price. Because of Dana's high reputation, there are many counterfeit or refurbished products. So if you want to buy such a big brand of stereo, you must find an authorized construction shop. Don't be greedy and suffer big losses.