Well, there is developed in Europe an ergonomic mouse that is actually so I experienced hand pain prevents here good for health; but my first impression when I took them out of the package, came over the nose and was not so good, because I thought to smell pure poison. And it does not smell still healthy after a long time! The environmental standards are just another in China. This mouse would have deserved something else. Only because of its smell, I would not order again, and from my main workstation I have long since banished wacom Thanks to.