RIP TUNES MP1872 Instruction Manual page 9

Repeat Mode Setting
Select Settings > Music > Repeat Mode. By pressing the  or  or buttons,
the play mode will change in the following order: Once, Repeat One, Folder
Once, Folder Repeat, All Once, All Repeat and Intro. Press the M button to
confirm.
Shuffle
Select Settings > Music > Play Mode. Choose between Order and Shuffle by
pressing the  or  buttons. Press the M button to confirm.
A-B Repeat
While playing music, press the ● button one time to set the start point A, the
LCD screen will display A-. Press the ● button again to set the end point B, the
LCD screen will display A-B.
The player will start to repeat the section. Press the ● button a third time to
exit. The A-B repeat function is not available when paused.