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These are wireless headphones - plug the base in and connect it to your sound output (speakers, computer, TV, whatever you like), set the channel and away you go.
Comfort: Very very comfortable, and very adjustable. sit easily and don't slide off like some, but also aren't tight on your ears.
Range: Very good - I can go all over the house and still have crystal clear music! I've not used it at the max range (110m), but quite often have been downstairs at the other end of the house giving it a couple of walls and a ceiling/floor to go through.
Sound quality: Mostly very good once you find the right channel - it has 3 options, 1 has a little ocassional interference for me, the other 2 are fine. The sound is crystal clear mostly, ocassionally some slight crackling at higher volumes but nothing I'd complain about.
Batteries: The headphone unit takes 2 x AAA batteries which last quite a few hours, I use rechargables and they seem to last forever. You remove the earpad (both are removable, I presume they can be replaced) and slot them in.
They do auto turn off after a while of no interaction, which is great - unless like me you forget to remove or turn them off and suddenly get white noise! I've also had them turn off once or twice when connected to my PC even when in use, but only when plugged into my base unit instead of speakers.
Lovely headphones, I'd recommend them to anybody.