1.PC interface supported:USB+Bluetooth,support all blue tooths cellular phone
2.Digital formats supported: MP3/WAV/WMA
3.Signal-to-noise ratio:87.2dB
4.Playback Modes:Random play
5.External hard drive function: Yes
6.Sound output mode: Stereo
7.Audio Additional features:Auto-power off
8.Earphones type: Binaural
9.Mfr estimated battery life : 6hours continuous
10. Charging Time:3hours continaully
11. Battery tape/capacity: Built-in Lithium lon Polymenr/3.7v,150mAh
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.Memory Flash:128MB-1G
17. capacity : 128MB256MB512MB1GB
18.color : black/silver/white/ yellow/green/blue