Designed for the active wearer, our SportClip eliminates the need for a conventional headband by clipping easily and comfortably around the ear for a secure fit. Ultra-lightweight, it fits easily into any travel or workout schedule. Small enough to fit into a briefcase, knapsack or pocket, our SportClip includes a see-through, compact, wind-up spool carrying case for easy storage and protection when not in use. For all portable audio and video devices, MP3, CD and DVD players. Specifications: Frequency Response: 80-20,000 Hz, Impedance: 32 ohms, Sensitivity: 98 dB SPL/1mW, Distortion: <1%, Cord: Straight, Dual Entry, 4ft.