Utrasone HFI 550   (Discontinued by Manufacturer) S-Logic natural surround sound moves the sound out of the headphones and into the room around you for a spacious three dimensional sound Safer listening, less fatigue - pressure to the ear drum is decreased by up to 40% for the same perceived loudness, significantly reducing the risk ULE technology with MU Metal shielding to reduce radiation by up to 60% compared to ordinary headphones 50mm professional durable Mylar driver provides high volumes and superb isolation, even with lots of outside noise. 1/8 plug, screwable adaptor, Demo CD, and carry bag included