Does a car CD player usually come with place to plug in your own MP3 player, or do you have buy one that special feature?

Most modern car CD players come with an auxiliary input or USB port that allows you to connect your own MP3 player or other external audio devices. This allows you to enjoy music from your MP3 player in your car's sound system. However, some older car CD players may not have this feature, so it's a good idea to check the specifications of your specific car CD player or consult the user manual. If your car CD player does not have an auxiliary input or USB port, you may need to purchase a cassette adapter or FM transmitter that allows you to play audio from your MP3 player in your car's sound system.