Music Band-It, a GRANDMAX exclusive, is the perfect accessory for your iPod and MP3/MP4 player. It is designed for mobility; and with the patented retractable technology, the earphone cables retract eliminating unsightly cables. Patented one-way retractable prevents cable tangles, Superior sound quality, 4ft cable length is longer than most headsets, Free In-Ear Adapter , 3.5mm plug, Compatible with iPod and iPhone. Unique clip design; attaches to your pocket, or just about anywhere Works with Grandmax armband, or any other armbands. General Specifications: Product Type Retractable Earphones, Compatibility iPod, iPhone, other 3.5mm based MP3/MP4 players. Details: Plug 3.5mm stereo, Microphone None, Cable Length 4 feet, Frequency Range 20-20,000 Hz, Sensitivity 96±3dB, Impedance 32 Ohm, Maximum Power Input 5 mW. Package Includes One retractable headset, one pair silicone In-Ear adaptor. Other Features Patented retractable design. iPod® and iPhone® are trademarks of Apple Computer, Inc., registered in the U.S. and other countries.