Lets you connect to a mini USB charger and use that to charge your ipod/phone. Also works as a PC docking stand. BUT, its sadly let down because you cant connect your headphones to your device once its docked. If it featured a pass through to an 3.5mm headphoen jack it would be the dogs knees.
Headphones are comfortable and seem to have good noise cancellation for a computer room with heavy background hum. The headband doesn't fold ( and the plastic doesn't fill me with confidence as I tend to through headphones into packed bags ). It would also be better if the cable ran from on side only. But having bought for less than £30 its a small compromise for a set of good headphones.
These were bought after trying some Dr Dre Beats Solo. These give much better sound quality and comfort.