Features: Support various audio frequency format Repeat downloading music, support MP3/WMA/WMV/ASF and other music format etc U-disk ú¼Portable USB2.0 storage disk: No driver need above WIN98 system Top-class lens Top-class sunglasses lens, Polaroid lens, optical lens for your choosing, resist ultraviolet radiation and plated film Battery Rechargeable 3.7V polymer battery, play MP3 for 4-6 hours continually Power saving ú¼Automatic power off when it finish playing MP3 or it is in the stand by for 30 seconds Led light Indicate different states Color: Black ,Silver Accessories: Users' manual, Charger,USB wire, Car charger(additional)