UR40 Lightweight Headphones Heavyweight sound intensity teams with an ultra-lightweight design to create the ultimate in on-the-go listening, the Koss UR40. With improved signal transmission and conduction for a clean and clear sound, these headphones will minimize mechanical distortion and ensure exceedingly accurate sound reproduction. Featuring a hybrid design, the UR40 integrate the best of closed and open style headphones. Closed leatherette ear cushions form a tight seal around the ears to enhance bass frequencies, while screened ear cups provide an open, hear-through sound that keeps you in tune with your surroundings. The result: a clean, full frequency, great sound that turns every recording into a “live” performance. At just over six ounces, the Koss UR40 headphones wear comfortably, store easily, and travel lightly. Titanium sound in a collapsible, lightweight package. Features: Full-frequency clean sound turns any recording into a "live" performance Screened ear cups provide open, hear-through sound letting listeners stay in touch with surroundings Closed leatherette ear cushions form tight seal around ears, enhancing sound bass Enjoy greater volume levels, even with low-voltage portable devices Airy mesh sling provides soft, breathable support Lightweight frame (just over 6 oz) folds into protective compact configuration for easy portability Includes a straight, dual-entry 4 foot cord with gold-flashed 3.5 mm (1/8-inch) plug Covered under the Koss Stereophones Limited Lifetime Warranty Specifications: Frequency Response 15-22,000 Hz Impedance 60 ohms Sensitivity 98 dB SPL/1mW Cord Straight, Dual Entry, 4ft