This helmet is almost everything. It can allow you to listen to music through a mini SD card, connect to all devices on the "Bluetooth" feature, and enable you to deal with small insomnia without disturbing your neighbor when she sleeps in the same bed you.
For purists, the bass is very present, but if you listen to a CD on a computer, simply adjust the treble and bass on "his" system. that's why I did not put five stars because the treble and bass is lacking.
That said, it's a great device which I do not regret the purchase.
Kind regards. JM MARTIN