Audio Compatible format: MP3, WMA, ADPCM 3D Stereo Sound Integrated Microphone supporting ADPCM recording. Five different Equalizer modes Voice output power: 5mW + 5mW Voice output frequency: 20Hz ~20KHz Memory Storage: Available flash memory size: 512MB, 1GB Standard USB 2.0 port Integrated USB drive Share same USB port for Download, Upload and Recharge Battery: Continuous Playing Time: 8 hours Recharging Time: 2 hours 230mAh / 3.7V macromolecule polymer Li-ion recharging battery Automatically detected battery voltage and capacity Battery Consumption Saving function Battery recharge jack shares the same upload & download jack, all on the right side of the stem.
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