I've bought the player for my car. My radio does not have a USB port, but an auxiliary input jack via.
The device is very easy to use (just slide slider from Off to one of the other two positions and we go) and has a very good battery life. The promised 15 hours I could even surpass them.
I've noticed that the player did not continue before a firmware update to playing when you turn off song on the previous point, but began again.
Example:
You hear a song and is just at the point 1:30 and then turns off the player.
When back on the player plays the song again from 0:00.
That was a problem for me, because I have a DJ mix with 90 minutes the players have, among other things, he has then played again and again from the beginning.
However, the problem I could solve correctly by I the current firmware update (Version 2.05 - Stand 03.18.2015) aufspielte.
Now is the player the song reliably up where you left off previously.
With a car charger with USB port allows the player load problems while driving and also plays on.
Very simple, but good device!