1. The car must have at least a USB interface or SD card slot. If there is an SD card slot, just download the songs directly on your computer and copy them to the SD card.

2. If the car does not have an SD card slot, just buy a card reader and plug in the USB and SD card at the same time. Note: Audio MP3, WMA, FLAC, etc. generally only need to be copied to the SD card for playback, and there is no need to worry about format issues.

Extended information

Car MP3 players can be mainly divided into the following six categories.

1. From the perspective of power supply methods: cigarette lighter-type car MP3 and battery-type car MP3 (AA battery or button battery).

2. In terms of audio sources: there are independent audio interface car MP3, USB disk car MP3 and car integrated MP3 players.

The working principle of the above car MP3 players is very simple. The audio signals output by various portable music devices, such as MP3, CD, MD, etc. are transmitted wirelessly to the car FM stereo radio equipment. The car owner only needs You need to set the frequency of the car radio to the frequency of the car MP3, or let the radio search for this frequency to play.

3. From the perspective of functional principles: There is also a separate type of digital disc cassette-type vehicle-mounted MP3 that is exclusively used for special cars and uses the CDC disc package interface behind the original car CD host to expand wiredly.

This kind of car MP3 is connected to the original audio host with a direct wire, that is, line-in technology. It is controlled by the original car audio buttons (can be controlled by the steering wheel buttons), and the wired connection method reduces noise interference.

The sound quality is comparable to CD discs. Because the original car CD host is used to expand the wired connection, the requirements for the car audio host are extremely strict, so it is closely related to the original and modified car hosts.

Reference: Baidu Encyclopedia-Car MP3