Before you go any further, prise the unit apart and tighten that nut. The case snaps together - you won't break anything prising it apart with a small screwdriver. Do make sure that the USB plug can fully penetrate the USB socket. I had to file down the case slightly to ensure that the plug would penetrate, which could be your problem too.
Xtrons dab+ Stick just compatible with Xtrons android radio. XTRONS DAB+ USB 2.0 Digital DAB+ Radio Tuner Receiver Stick NUR für die XTRONS Android Auto-Stereoanlagen
@@gerdkisslinger3740 >Its their DAB aerial .And they are sorting it out and this causes them to lose sales .I would have purchased one .But luckily read about the issues