ALLSpecifications:
1.PC interface supported:USB
2.Digital formats supported: MP3/WMA
3.Signal-to-noise ratio:87.2dB
4.Playback Modes:Random play
5.External hard drive function: Yes
6.Audio Additional features:Auto-power off
7.Earphones type: Binaural
8.Mfr estimated battery life :5hours continuous
9.Charging  Time:3hours continaully 
10.Battery tape/capacity: Built-in Lithium lon 11.Polymenr/3.7v(volt),200mAh (milliampere)
12.Maximum imput power rating:5VDC,150mA
13.Voice output power:55mW
14.Voice output frequency:20Hz-20Khz
15.earphone impendance:16 Ω*2
16. Flip-up lens
17.Memory Flash:128MB-4GB
18.Colours:  Red  White  Black  Blue
polarized lenses
Package Contents:
  MP3
  USB Cable
   Driver CD
  AC adapter
  User's Manual

Packing:
50pc/carton,Carton Size:48*41*41CM,G.W:13KG,  N.W:12KG