Sony MDR-D777LP Altus Stereo Headphones (Discontinued by Manufacturer) Lightweight, Closed-Type Design 40Mm Driver Collapsible Design For Ultra Portability Auro-Nomic Design For More Natural Reproduction & Enhanced Wearing Comfort Stereo headphones with aura-nomic design for increased comfort and elite sound High-definition neodymium drivers produce 8 Hz to 80 kHz frequency response Built-in ambient sound switch lets you hear outside noise while on the move Aura-nomic design angles drivers parallel to ears for more natural listening Foldable mechanism fits inside pouch; 3.94-foot cord; 1-year parts warranty