Constant static and buzzing during playback, an auto turn-off feature that blasts static into your ears if the volume source is silent for a minute, awkward physical design where the headphone have actually just fallen off my head from slight movement, a charger that fails to charge unless the headphones are placed just so... And then they just completely stopped working in less then two months... The combination of terrible design and awful execution is truly stunning. Easily the worst electronic device of any kind I've ever bought. I didn't know it was possible for a pair of headphones to be as bad as these.