One way to accessorize your car is to choose the best car mp3 player. It is a great way to listen to your favorite songs while driving! An AM/FM radio just doesn't seem like enough anymore. It is because of this reason that older cars can have internal AM/FM/MP3 players installed. There are two major types of car MP3 players: internal and external. The internal ones replace the current system in the dashboard, while the external ones usually connect via wire or adapter. However, not all of these will have the features you want so you should look into what's most important. Another thing is to check the sound quality and radio reception.