Im going to change the original radio in my auto..and add some in car accessories, like car DVD..how many types in total?and what abt the functions?

 

There are two main types of in car DVD systems: portable and in-dash. Portable systems, though not as sleek or worry-free as the in-dash ones, are considerably cheaper and more versatile. The latter systems are hardwired into your vehicle's entertainment system. They display movies either on a screen in the center-console, on a screen that descends from the roof of the vehicle, or on a screen which flips up from the dashboard.