beyerdynamic DT 990 Premium Edition 250 Ohm Over-Ear-Stereo Headphones. Open design, wired, high-end, for the stereo system The famous DT 990 Premium, 250 ohm version; Stereo Headphone excellent open ear design, true sound reproduction. Connectivity Technology: Wired Made in Germany, innovative "Bass reflex" system for excellent audio performance Open design, includes carry case, 11 oz light weight Gold vaporized stereo 3.5 mm mini-jack & 6.35 mm adapter included 2 year manufacturer warranty only when purchased from an authorized beyerdynamic dealer.