Impeccable 121,312 March 61

The audio quality is at the rendezvous, tested with classical music, pop, rock, electronica.
The record is accurate, we can broadly distinguish all the instruments (I think mainly classical music).
At low they do quite well, not too strong, not too weak.
The highs are also well proportioned.
In terms of autonomy, he spent the 25 hours, I have not tested beyond.
Scope of around 10m.
An equally important point on insulation: you can totally hear in open-space, your employees will not be embarrassed; if there is ambient noise (discussed ...) once the music started you hardly hear anything, see anything (I like to listen to loud).
The headphone jack can be used without problems, even with empty battery (I say this because some wireless headsets will not do).