Digital formats supported: MP3/WAV/WMA              
Signal-to-noise ratio: 87. 2dB              
Playback Modes: Random play              
External hard drive function: Yes              
Sound output mode: Stereo              
Audio Additional features: Auto-power off              
Earphones type: Binaural              
Mfr estimated battery life: 6hours 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 ¦¸*2              
Memory Flash: 128MB-1G