1) Mp3 Sunglass Polarized lenses (anti-scratch) and TR 90 frame
2) FM funtion
3) Available flash memory size: 1GB-8GB)
4) Compatible format: MP3, WMA, ADPCM
5) Standard USB port: USB2.0 (full speed)
6) Integrated USB drive
7) Play function: Play in order, pause, resume playing
8) Delete function: Delete current or all songs or recordings
9) Integrated microphone supporting ADPCM recording
10) Continuous playing time: 8 hours
11) Recharging time: 2 hours
12)bluetooth can be optional