The only that all my 700 folder has recognized on my USB stick.

USB:
Unlike the radio from Sony and Pioneer, all my 700 albums were displayed on nem 64GB Stick and could be played.
The reading of the stick takes 21 seconds (depends possibly also from the stick from .. the Sandisk is not the fastest), while all over random mode, there are fortunately no waiting.

Sound + settings:
The Sound settings are varied .. for me a little too much possibilities. In addition to the 3-band EQ, there is the possibility to switch 2-3 Loudness and Bass booster stages. One option is to improve the sound of MP3s and the 3-band EQ can be next to Level to adjust even a frequency and a Q factor. Sounds totally great but I do not have really made a sound with ear-friendly centers and rich bass for clear high volumes set. But may be due to me and the sound itself is not bad either. Previously had a Sony radio installed, the sound had me, just like it better in my car.

Bluetooth:
Everything worked out very well. The connection comes quickly to pass. Have played from your phone's MP3. The titles were displayed and I was able to switch on the radio the title.

Speakerphone and radio reception I have not tested.

All in all a good and cheap radio.