GE A1250 - Manual (Page 52)

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During the video playback, an operation guide appears
on the screen. You can use the navigation pad to per-
form the functions accordingly.
During the video playback, you can use the Up/Down
navigation buttons to adjust the volume of playback.
During the slow motion playback, you can use the
Left/Right navigation buttons to adjust the speed of
playback.
Volume will be muted when using the slow
motion playback.