Specification :

1) Product information: Bluetooth 1. 2V
2) Range: class 2, distance in 10m
3) Combination of Bluetooth and MP3
4) PC access: by USB
5) Digital formats supported: MP3 / WAV / WMA
6) Signal-to-noise ratio: 87. 2dB
7) Playback modes: random play
8) External hard drive function: yes
9) Sound output mode: stereo
10) Audio additional features: auto-power off
11) Earphones type: binaural
12) Mfr estimated battery life: 6 hours continuous
13) Charging time: 3 hours continually
14) Battery tape/ capacity: built-in lithium, 3. 7V/ 150mAh
15) Maximum input power rating: 5V DC, 150mA
16) Voice output power: 55MW
17) Voice output frequency: 20Hz - 20kHz
18) Memory flash: 128MB, 256MB, 512MB, 1GB