I'm selling my Senheiser IS850s in excellent condition with original package. IS850 is wireless version HD580. Digital IR transmission system achieves absolute no noise.
This is Europe version (220-240V), so US user have to
1) order US version AC-DC adapter from Sennheiser (I'm not sure if it's avairable now)
2) use step-up transformer
3) use another AC-DC adapter.
I got another pair of IS850. Now the condition is average as second hand, so the price is reduced to $250 including shipping. Note that Sennheiser US probides US version AC/DC adapter for free of charge!!