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Description:MP3 sunglass GBMP-320 1) PC interface supported: USB 2) Digital formats supported: MP3/WAV/WMA 3) Signal-to-noise ratio:87.2dB 4) Playback modes: Random play 5) External hard drive function: Yes 6) Recorder Additional features: Variable 7) bit-rate compatible 8) Sound output mode: Stereo 9) Audio Additional features: Auto-power off 10) Earphones type: Binaural 11) Earphones response bandwidth:20 - 20,000Hz 12) Voice-recording:7 hours continaully 13) Recharge time:2 hours continaully clip uplens with contours that maximize protection against sun, wind and side impact And we still have different colours, like silver, red. You can get the picture and description from our company webiste.