I hope this helps. I leave you a few videos about the device.
In this two videos you can see how the scrolling works. Take into account that these videos are from June so the firmware was not completely finished:
Video 1
Video 2
More videos of the device still from last summer:
Video 3
Video 4
Video 5 (review)
And a few up-to-date videos about the real Boyue device (in Chinese) where you can see how the device really works now:
Video 6
Video 7
Video 8
Video 9
Video 10 (English menus- no sound)