The Koss UR29 noise isolating headphones pack powerful studio sound into a portable, collapsible unit. With enhanced bass and full frequency response, the UR29 headphones are ideal for DJs and listeners who crave the Sound of Koss.The UR29 headphones deliver great volume, even with low-voltage portable devices. Closed leatherette ear cushions seal comfortably around your ears to block outside noise and keep music from leaking out. Feel free to listen loudly without disturbing roommates or coworkers. When the music stops, the UR29 full size headphones collapse down into a convenient size that is easy to carry and even easier to store.