This closed-back Sennheiser HD 4.50 wireless headset offers just about everything music aficionados with an active lifestyle could wish for: a stunningly detailed and powerful sound, the wireless technology, intuitive ease of use and an elegantly minimalistic, yet robust design crafted from high-quality materials. Sennheiser's NoiseGard active noise cancellation lets you enjoy your music in peace - everywhere. May include substituted high quality cables.