Aigo UM-F158 - Manual (Page 38)

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Freedom in technology,Freedom in life
* Why can’t the manager format the player?
You may have opened the player in another file browser. If so,
please close it for formatting.
* How can a WMA file be compressed?
To assure that the compressed file can be played properly, we
suggest you use Windows Media Player 7.1 or higher, which
you can download for free from the Microsoft website.
3 Specifications
Model Name aigo MP3 UM-F158 Plus
Built-in Memory
128M/256M/512M Flash
Memory
Screen 96*39 OLED
Battery
1 size AAA battery, up to 7 hours
of playing time
Earphone Output 7Mw x 2/32 ohm
Output Range 20~20KHz