Beyerdynamic SX 10 Trendline In Ear Sports Headphones (Black) Lightweight, comfortable sport headphones with behind-the-head neckband Ideal for joggers, inline skaters and other people who listen to music on the move Compact, high-quality drivers produce 20 Hz to 18 kHz frequency response Foldaway design for easy transport Single-sided cable with 1/8-inch stereo mini jack