Clear sound, fits perfectly, lightweight

The helmet fits perfectly iKross alone, the ergonomics are such that there is no need tips of different sizes for the proper placement as morphologies. You can violently shake your head, the helmet will not leave its location on your ears. What makes it perfectly suitable for jogging practitioners / jogging / running like myself.
The sound has a very good level and it is clear! Bluetooth is perfect, it instantly connects to my tablet Onda V989 AT80, I can stand more than 8 meters from the source without the walls of my apartment would block the receipt or interfere.
Autonomy corresponds to what is advertised.

This is the first time I am almost completely satisfied with a walkman headphones.