This is a Brand New 2GB Sunglass Mp3 Player!!Specification:*Extremely comfortable and secure for the most users, Bicyclist, Runners, Joggers, Hiker etc.*2GB Built-in Flash Memory*Powered by USB port or wall charger*Audio format: MP3, WMA, WMV, ASF, OGG,  With stereo earphone!*Battery: Build in Li-ion battery.(3.7V  150MAH)*With Play & Stop button, easy to control*With Volume control button: +/-,  also function as fast forward & fast backward button.*Working time: 5-8 hours.*Recharging time: 3-6 hours.*With USB 2.0 interface*Plug & play, no sync software needed, just drag the music in your computer and drop into this unit.*S/N ratio: ≥86dB.*Output frequency: 20Hz-20KHz.*Working temperature: -10~45 degree.*Color: BlackPackage including:*1X 2GB Sunglass mp3 player*1X Black case*1X USB cable + US Charger*1X Cleaning Cloth*1X English User Manual