As for the sound quality, this is of course always a point at which the ghosts. Personally I find it very nice (for such a small speaker). Where certainly the weight of the speaker and be more stable state plays a major role!
To use the option and Micro SD cards are then the rest. In short, my daughter is thrilled and has equally taken the speaker firmly in fog. In point price / performance there is probably nothing to complain about. We had already had much poorer loudspeakers!
I can recommend the speaker definitely.
I still have a photo of my speakers reingesetzt on the blue light to see the lights in operation. Personally I find it very appealing.
Battery life is very good and loaded it is also very fast.
Even my very old Nokia cell phone fits in very well with the speakers!
Magdalena