A mouse that is based on ergonomics and has a shape which is somewhat unknown

It is imaginable even how to have it by just looking at it ...
WOWPEN
http://www.bizmaker.co.jp/wowpen/wowpen.html

Each button has this arrangement
http://i.gzn.jp/img/2006/03/13/wowpen/wowpen01.jpg

It seems to be a mouse to hold like a pen. In addition, because it is based on ergonomics, it seems easy to hold in fact .... The price is 49.99 dollars.
It seems that once in genre it will be called "optical pen mouse" ...