· Music file formats:MP3/WAV/WMA I

· nterface:USB2.0 protocol (FS)

· Battery life:Successive 5 to 6 hours if battery is fully charged

· Battery voltage:3.7V

· Power output:55mw

· Earphone output:5mw

· Frequency response:20Hz - 20KHz

· Recharging time:3 hours

· Normal operating voltage:30 - 35mA

· Memory:128MB - 1GB

· Signal-to-noise ratio:86dB

· Size:ф43mm * 12mm

· Earphone impedance:16 Ω*2