Polk Audio UltraFit 1000a In-ear Sports Headphones for Android Ultra-high performance digital sound, focused details, full fidelity and deep bass. Convenient 3-button in-line controls & microphone, for on-the-fly audio and phone control without breaking your stride. SecureFit support keeps your headphones comfortably in place. Ultra-flexible tangle-free planar audio cable eliminates cable tangle. Two easily-switchable custom lengths included, including a 14-inch length specifically for iPod nano, iPod Shuffle and other MP3 sleeve and collar connections. StrainGuard Kevlar core technology and computer-designed transitional connections eliminate cable failure.