the function of USB/SD port for car DVD

[mycar1111]

Right now, many car DVD with USB/SD port now, even some of the single DIN head unit without DVD player, just have USB/SD port for MP3/MP4. also some of the headrest ,flip down monitor also without DVD player, just have USB/SD.

Actually USB/SD port is very useful for car video units,with this port,consumers can download audio/video from interent to the USB or SD CARD,and can also play on the car video unit, that can make the unit cost more cheap without DVD. 2nd, customer can also use the USB port to play the games with joysticker

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