Verto 1600 DPI USB A Optical Ergo MouseAll natural The Verto Ergonomic Mouses ergonomic shape places your arm and wrist into a natural 60 degree position, reducing arm and wrist strain so you can work more comfortably and productively. Next levelcomfort A lightweight design and thumb rest further improve comfort, while a rubber coating improves grip and durability keeping you focused and efficient. Stayincontrol An optical sensor capable of 1000 and 1600 DPI and 6 buttons 2 main, 2 side, a