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PC interface supported: USB  ~~~            
Digital formats supported: MP3/WMA   ~~~            
Signal-to-noise ratio: 87.2dB  ~~~             
Playback Modes: Random play   ~~~            
External hard drive function: Yes   ~~~            
Audio Additional features: Auto-power off   ~~~            
Earphones type: Binaural   ~~~            
Mfr estimated battery life: 5hours continuous              
Charging Time: 3hours continaully              
Battery tape/capacity: Built-in Lithium lon Polymenr/3.7v, 150mAh              
Maximum imput power rating: 5VDC, 150mA              
Voice output power: 55mW              
Voice output frequency: 20Hz-20Khz              
Earphone impendance: 16 O*2