Very good headphones, the sound is crystal clear. The integrated electronics is much more efficient than the electronic nomadic devices (phone, ...). Autonomy is more than comfortable. The hands-free phone function works great, but beware, the microphone picks up ambient sounds all (reverb, noise, ...) One default, the power cable that have been the same type of standard mobile devices (USB mini-B) making it necessary to have plenty of rope around my computer.