1. U-disk, can repeat downloading music, support MP1/MP3/WMA/WMV/ASF/WAV and other music format etc. 2. Polarizing lenses, top-class sunglasses lens. 3. Bluetooth function, support many kinds of mobile phone. Working rang up to 12 meters. 4. Continuously work for over 6 hours. 5. Earphones have flexibility and can be fixed within an angle of 270 degrees at random.