AGPtek G15S User Manual page 4

Bluetooth mode and normal mode.
 Repeat
Here appears 4 options, Repeat 1, and Repeat All, Repeat
off, View Playing.
 Shuffle
Choose On or Off mode as you want.
 Equalizer
Here are 7 equalizers for your option, Off, Rock, Funk, Hip
Hop, Jazz, Classical, Techno.
 Variable Speed Playback
Adjust the play speed from (the slowest)-8 to +8(the
fastest).
 Repeat settings(only available when the music is playing)
Repeat mode(A-B):choose the option Replay mode, click
to confirm the starting time A (A is flashing).
Then click the button to set the ending time B(B is
flashing). Click the button again to confirm. The icon for
A-B indication will appear on playing screen. And the audio
from time A to B will be repeated automatically.
Replay times: Set the replay times from 1 to 10.
Replay intervals: Set the replay interval for 1 to 10
(seconds).
 Bookmarks
It is marked by the stopping time as "hh:mm:ss". So you can
set the stopping time before you add it for continues
playing next time conveniently.
You can add up to 10 bookmarks for each of the song. If
there are more than 10 bookmarks, the old one bookmark
will be replaced by the new.
You can find the bookmarks you saved with the option "Go
to bookmark" under submenu "Bookmarks", and you can
delete them with the option "Delete bookmark".