A、Correct Pen Grasp Method and Gesture：
   PC-PEN adopts the ultimate principle of mouse to design the structure, so you must
   hold the pen correctly. Otherwise, if you hold a mouse backward, can it be used as
   normal? So we demonstrate both the correct and wrong pen grasp method and gesture
   below to make a contrast.

Front of pen      Back of pen

（A）、Front and back of pen，just like holding a ballpoint pen, then you can write
       your own handwriting. Never hold the pen backward, do keep all buttons and
       rolling key toward the front of pen to use conveniently.

（B）、Grasping gesture is very important. It must be like holding a ballpoint pen.
       Please refer to the following pictures:

Correct grasping  Wrong grasping