I'm totally fan of this helmet! The design is very nice, this helmet does not gross forms, it is neither too big nor too small. It is very light. The package also proves the seriousness of the product. The more mega? It is very, very, very comfortable! It has Bluetooth function to be able to listen via another device that has the same function, but also the good old wire to be able to connect directly. Do not rely on the indication Apple Iphone etc. It works great with a Nokia or Samsung Windows Phone running Android. The connection is made easily as any Bluetooth connection. Do not have wire gives a new sense of freedom! Using headphones is childish. The voice that tells us the percentage of the battery is in English, but this is anecdotal. No batteries to recharge simply plug in USB. Finally, the sound is very pure, very clear and faithfully reproduces the original sound. Definitely, this is pure happiness! A delight for the ears!