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A. There can be 12 buttons.12 file folders (folder 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12) correspond to 12 buttons (k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k1, k12). Folder 00 is played as homepage.If you push either button, it will play the files in the corresponding folder, when the display of this folder finished, it will loop play the files in folder 00.

For example, if you press button "k1", it will play files in folder 01. And if you press button "k1" again during the process of play, it will replay from the first file in folder 01. When it finished playing files in folder 01, it will turn to loop play files in folder 00. If you press button "k2" during the process of playing files in folder 01, it will turn to play files in folder 02.
If no button being pressed it will also loop play the files in folder 00.

B. There can be 10 buttons which are corresponding to 10 file folders (folder 01, 02, 03, 04, 05, 06, 07, 08, 09, 10) in the memory card.

There is no Folder 00. If you push either button(from button k1 to k9), it will play the files in the corresponding folder, when the display of this folder finished, it will turn to a black screen.Only if you press the button "k10", it will loop play files in folder 10 all the time.
If no button being pressed it will also be a black screen.

D. There can be 12 buttons. There should be 13 folders in the memory card, folder 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12. And the 00 folder is played as homepage. Press either button, it will play the files in the corresponding folder.

During the process of playing files, it is ineffective to press other buttons (there will be a palm in the top left of the screen as a reminder). Only when the media player finished playing the files in the corresponding folder, and turn to loop play files in folder 00, it is effective to press other buttons.