1 - Unable to properly stabilize the frequency, so bad sound with crackling and interference with radio stations: as the sound is also very small you have to put the volume up, leaps to see what I do when NRJ covers transmission this device! 2 - Do not store the last played song, and ... 3 - The folder navigation is not just expected, it can be done but must outwit 4 - Selection by no track does not work from one folder to another