Cute & practical idea - implementation flawed

Shortly to my "test environment": have a smart (BJ 2000) with cassette deck, I would like gehieft with this adapter into MP3 era. Until now I used to a Hama cassette-to-jack adapter Hama CD adapter for the car (CD / MD / MP3); the music came X5 MP3 player from Cowon nem and was then fed up through this adapter. Advantage of this method is that you have a display (MP3 player), the music thus can easily choose a good equalizer available, etc. pp. The only drawback: the unsightly cable hanging out of the cassette drive. That's why I got myself even now the adapter Technaxx who solves the latter problem clean.

Here are the results of my little exit by car (+ Adapter ;-)):

+ Simple implementation ("depp safe")
+ Remote
+ Wide range of accessories (incl. Micro SD adapter)
+ Light music upload
+ Used as an MP3 player

o Battery firmly integrated
o depending on the insertion direction, it is possible that the remote does not work or only very poorly. This can, however, easily solved by the cassette into the cassette deck inserts vice versa (I'm talking about the car radio!), Because then the receiver is looking for radio outside and not in the direction of the engine compartment

- Battery loud other reviews do not seem to be charged during use
- No charge indicator
- No Shuffle / Random Play
- SD card (if smooth at the rear end) difficult to be removed

- Poor sound quality !! Ok, my car radio is certainly not diiiee ultra conditioning, but even then you could tell the tinny sound of the adapter (is possibly due to poor reading head). With the Equalizer settings, although I have played around, but in the end I had to give up disappointed, because the sound is simply extremely shallow. At the end of the trip I'd rather have switched on the radio, because that sounds yet 5x better. What is interesting is that when I insert instead the aforementioned Hama adapter and the adapter Technaxx / MP3 player turn anstöpsel because it sounds the same music much richer and more "stable"! So I therefore deduce from this that the head when Technaxx is the great weakness and not the MP3 player ansich. Thus, it was probably saved here exactly at the wrong end, so he goes back immediately :(

What I can not confirm, is that the player would be too quiet (Radio untwist it ?!) and the remote control would in principle be bad.