If anyone is interested, I used it like 10 hours in my whole life so it is in very good condition. And I'm no musician so I may haven't hit once some keys, lol.
Here are the specs :
I have the USB cable, the external power wire was optionnal.
And the picture with the features :
Tell me your price, 8.40 € for shipping in Europe, will look over shipping price if you're outside of the EURO borders.
If you want additionnal pics, ask me by PM.