The UF-30 Headphones have been specifically designed to work with the iPod and similar portable devices. At the heart of these lightweight, foldable headphones are NuForce's proprietary Ultrasone® drivers for utmost clarity and tight, deep bass. Ultrasone's patented S-Logic Natural Surround Sound delivers a three-dimensional image, creating a sound-world significantly different from that of conventional headphones. Nuforce has utilized its high-end audiophile sound expertise to introduce the UF-30. Users will find that UF-30 outperforms many similar headphones costing more than 2 to 3 times its price. Return within 30 days for a full refund if you're not satisfied with the sound quality. Like many audiophile devices, the UF-30 will be at its sonic best after about 40 hours of play-time.