Sony MDR-NE2 Neck Strap Stereo Earphones Convenient Headphone System With Neck Strap Neodymium Magnets For Superior Sound 13.5Mm Driver Units Hangs Small Portable Digital Music Players Ideal For Lightweight Portable Players Neck strap to hold your small digital music player Neodymium magnets reproduce superior sound 13.5mm driver for wide frequency response Frequency response: 16Hz-22kHz