· Digital formats supported: MP3/WAV/WMA

· PC interface supported: USB2.0protocol.(FS)

· Mfr estimated battery life: 6 hours

· Battery tape/capacity: Built-in

· Lithium Ion Polymer/3.7V, 150mAh

· Maximum input power rating: 5VDC, 150mA

· Voice output power: 55mW

· Earphone output power: 5mw

· Voice output frequency: 20Hz-20Khz.

· THD: Less 0.05%

· Recharging time: 3 hours

· Normally works voltage: 30-35mA

· Memory Flash: 128MB-2GB

· Signal-to-noise ratio: 87.2dB

· Earphone impendance: 16 Ω*2