•Ray light (long press to turn on the ray, release to turn off)
•Page up key: click to turn up page, long press full screen/exit
•Page down key: click to turn down page, long press black screen/exit.
•Annotation key: Long press PPT annotation/exit annotation 2. Double click to clear annotation
•Volume up/down key: Click Volume up, long press to switch to hyperlink connection function, double click to open hyperlink.
•Volume decrease key: Click on volume decrease, long press to bring up eraser/exit eraser