Hi, I am an owner of a mazda 3 sport hatchback (2005). is a bit of time to search the Internet for ways to change my head units without losing control of the onboard computer. At first I was focused on some radio or the like EONON Caska but the costs are too high for what I need. The only request I have is the ability to listen to the mp3 may receive the title on the display. Another question is whether I can install an external charger that is compatible with CD/MP3 car radio serial. Do you have any tips? sorry for the google translation ... Thanks!