The rear USB port I have laid with a USB extension in the glove compartment, so you can connect an external USB hard drive in the glove compartment for example.
The operation, however, is very simple and you can not go far wrong. The menu is kept really simple and you can only set the necessary things. Who many gimmicks, like different color schemes or even wallpapers or so expected here will be disappointed.
When touch screen is a screen which reacts to pressure. As you certainly have to apply some pressure, you can sometimes get the impression as if the same breaks off the monitor. But this is not happening to me within 1.5 years and also is the monitor, or the holder, not worn.
As I wrote earlier, I have (32GB SSD) had connected to the rear USB port, an external hard drive. I am still not come behind why this is so, but just when many songs on the hard disk are, only a fraction of its recognized and played by radio. For me then missed with more than 50% below the actual MP3 files.
Even the radio when reading an external USB memory is very sluggish. Overall, it makes any very sluggish feeling.
In addition I have connected the rear view camera. In combination with this, the radio is a bit strange.
Actually, the radio is set so that when the reverse gear is selected, the monitor automatically moves out, partly already takes an eternity, and then displays the image of the camera. Here is a positive development that appear in the image lines to help an in estimating distances.
Mostly it is so that short is the images from the camera, then the Radio "No Signal" and says 2-3 seconds after the camera signal comes back.
The highlight, however, if you reset a piece immediately after starting the engine, the radio turns after reversing without comment from. So you have to always have to wait until the radio has completely turned on and then go back, after which the radio will also.
Sometimes it also happened that the monitor is not extended when reverse gear is engaged, but has been shown in the small display "Camera".
The radio reception was not outstanding good but acceptable. The sound overall good and strong. Thanks Equalizer can these partly even adjust.
To watch a movie cinema on the monitor, this is something small. For a small waiting period, it is OK. I had tried myself to watch a 2-hour movie on what a very beautiful one, since details are lost in the movie and you can just hard to see some things because of the small size.
Bluetooth works to clean the radio and has worked for me without any problems both with various Samsung smartphones as well as with the iPhone 4 and 5. Also, you can stream music via Bluetooth to the radio.
Overall it's a solid piece of equipment, which certainly impresses with its "simplicity", but it is unfortunately also has a few quirks and pitfalls.