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Supported File Formats MP3 : MPEG 1/2/2.5 Layer 3, ~320Kbps, ~48KHz, mono/stereo WMA : ~320Kbps, ~48KHz, mono/stereo WAV : ~48KHz, 16bit, mono/stereo FM Radio Frequency Range : 87.5MHz ~ 108MHz, 76MHz ~ 108MHz (Japan Wide) Memory 2GB / 4GB / 8GB USB Interface High Speed USB 2.0 File Transfer Rate Max 35Mbps (Upload Max 40Mbps) Power Supply Built-in Rechargeable 3.7V Lithium Polymer battery(Max. 24 hours of continuous playback based on company test) Charging Time About 2 hours (either USB or Adap