Mach Speed Technologies TRIO V2400 - Manual (Page 5)

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4) Charging the player: To charge your player, set the power
switch to the ON position and connect the player to a powered USB
port. As a general rule, it will take 4-6 hours to completely charge
the battery on the player.
Main menu
The main menu allows you to access the different modes of your
player. You can access the main menu at any time by pressing and
holding the [MENU] button. Use the [NEXT] and [PREV] buttons to
navigate, and press the [MENU] button to make a selection.