Koss KTXPRO1 Titanium Portable Headphones with Volume Control Connectivity Technology: Wired Frequency response: 15-25,000 Hz Titanium-coated high-polymer titanium diaphragm for accurate sound Reproduction Foam ear cushions for open "hear through" sound Volume control on cord for easy level adjustment Straight, 4 foot, dual entry cord with 3.5 mm plug and 6.3 mm adapter