http://ohgizmo.disqus.com/enFri, 03 Nov 2006 09:02:48 -0000http://www.ohgizmo.com/2006/11/02/a4techs-optical-mouse-needs-no-batteries/#comment-1759900Because pen tablets cost considerably more than $21 and are not optical. Pen tablet mice also tend to be tricky to use.SeanFri, 03 Nov 2006 09:02:48 -0000http://www.ohgizmo.com/2006/11/02/a4techs-optical-mouse-needs-no-batteries/#comment-1759899Why wouldn't you just use a pen tablet?BrendanThu, 02 Nov 2006 18:20:52 -0000