Technically it has strengths, it's already a monster 17H autonomy Music listening for loading 2H-3H. Having a jack cable to connect it if it has more battery makes it immortal! The scope is very suitable 10m without walls. The coupling devices is very good too. I have no problem with my Nokia Lumia 920 to connect to my PC, however I am more doubtful, everything goes well but when coupling restart my PC sometimes sound sizzles for a reason that I do not know, I already had the problem twice, maybe bluetooth that is lost. Finally, the built-in microphone looks okay but not a reference.
Regarding sound quality - the interest of a number 1 helmet - he defends himself very well. I find that the soundproofing is good even in noisy environments. The volume level can be controlled via the headset, we have good levels without crackling. The bass is very present. Not the sound sometimes has "tin can" cheap helmets.
We also appreciate the 24 month warranty and product overall finish and its packaging.
I recommend this product.