Good but ergonomics review

The sound is good, an equalizer is even available in the menus to refine at best.
The helmet is a little light, it is better to replace it with a better quality.
Autonomy is correct, one can recharge by USB to computer or power outlet (via adapter not included).
The menu navigation is not very convenient, provided the software to transfer music from the computer to the player is not very ergonomic either.