Mainly features: Fashionable MP3 Sunglasses， combines a digital music player with world-class sunglass technology. I、MP3 function： 1、Support MP3、WMA music format. 2、With Mini B USB plug，direct connect to computer by USB cable. 3、Support backup important files and transport any kind of file from one computer to another. 4、No drive needs above the Win98 system. 5、Built-in lithium battery， Low power consuming， could play for 6 hours continually II、Sunglasses function： 1、Maintain critical clarity at all angles of vision that maximize protection against sun, wind and side impact. 2、Frame material offers all-day comfort. 3、The flip-up lenses block 100% of all UVA, UVB, UVC and harmful blue light.