Utrasone HFI 700   (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% (3-4dB) for the same perceived loudness, significantly reducing the risk of hearing damage ULE technology with MU Metal shielding to reduce radiation by up to 60% compared to ordinary headphones Extended low frequency range tuned to DVD's and CD's to ensure compatibility with DSP-systems such as Dolby Headphone and Yamaha Silent Cinema 1/8 gold plated plug,  gold plated screwable adaptor, Demo CD, and carry bag included