KOSS KTX16 Collapsable and Portable Stereophones (Discontinued by Manufacturer) Frequency Response: 40-15,000 Hz 2 for 1 portable stereophones with open, hear-through sound Collapsible design for portability Volume control for easy level adjustment, Ideal for DVD and videa use Straight, single entry 4ft. Cord, Includes Y-cord for listening with a friend