Music listening, acute are slightly eaten, the mids a bit too present. But the size of these speakers, frankly it's very good. The sound is immensely times better than the speakers iphone and ipad mini, and this is what I needed.
The autonomy is about 5 hours for now, which I think is honorable; I would have hoped for more given the size of the craft and the one I imagine the battery. But I'm not an electronics expert to know if it would have been possible in reality.
Charging 12V suggests we could recharge the car. Too bad that a simple passive converter (a wire with good enbouts) is not provided.