The Opt pencil is a quality instrument available at a fraction of its potential price. The sales slogan for this line in Japan is "Dress up!", and it was designed to accompany business people and travelers. It features a broad body for an ergonomic hold, a push clip that can be used to clip this pencil onto thicker objects, and a shaker function! This means that you can just shake the pencil and the internal weight mechanism extends the lead for you! No need to click (though pencil includes this feature)!
See shaker pencils in action in the following JetPens.com TV video!