Erasable writing on the whiteboard marker, portable size of the notebook.
There is also contains a page of plain pages and borders, it seems to help in a variety of applications.
Use and such as the shops of POP, for communication in overseas travel, we are drawing, TODO list, how to use, such as study of computational problems.
Human voice is handicapped, Human ear is handicapped can be used as a communication tool.
In size to carry around, white board notes that it is a wide range of use. Please check if you see!