Its big plus: its fast charge (1 / 2h) for long listening (up to 70h !!).
Light weight. Its simplicity.
One caveat: No fixing. We must hold it, or put it in the pocket.
Tips:
Before that think the locker by pressing just two seconds between the rear and volume keys.
For délocker, we do the same.
To increase the sound: support volume 2 seconds and advance key to increase and to lower back.
In summary, a good MP3, simple making what is asked.
(See photos)