Now that I have in my possession, so I can add that I believe could be used to some of you who have doubts about this product.
1 / SOUND: because after all that is being asked to do it better. The sound is good for this price range and the type of helmet. But be careful if you set the EQ can, because with the default settings for the sound was really bad shot. I will say that the sound headphones is good but it is your responsibility to check and make your adjustments.
There is a clear difference between the supplied headphones with my mp3 player, along with Philips headphones I had before and I had paid at the time 15 or 16 euros. For 10 euros difference I think the difference is relatively large.
2 / CONVENIENCE:
First small black adapters to allow the headphones to fit in your ears. Although personally I can put the small and average. Except that with the way I find that there is too much bass (necessarily suddenly the sound can not escape and the bass is too present to my taste, I'm not at all but like Mr. tuning well at least not overpower low which suddenly removes all the relief and subtleties of a song).
So, back to the moment of my jogging and 1 hour 30 not once I had a problem with. The adapters take very well during and after, I do not see how they can fall. Unless brutally remove the ears and in this case it is indeed possible.
The comfort is really appreciable. The adapters do not hurt, barely one feels the rubber around your ears. Then it's super lightweight, yet very lightweight. This is very surprising.
The FIL is sufficiently LONG. It allowed me to place my mp3 player in my back pocket without it being too short nor too long (I am 1.71 so if you're tall it will perhaps not long enough).
I think I made the rounds of these headphones.
Then I would say to improve the product, it would be good that they put a volume control (what I had before, so when a title to another sound varies, sometimes have to get the player then lower or raise the sound is not practical).
Overall I am very pleased with these headphones (and yet I had fears with tips and sound quality).
So for those who like to have a correct and also his wish to run with.