Ergonomic Vertical Wireless USB Mouse - Click in comfort with a wrist-friendly contour Work in your comfort zone with the vertical ergonomic shape of this Manhattan ergo mouse. Rest your hand on the elevated, smooth grip with easy-to-reach buttons and a snug thumb rest that lets you work without lifting a finger. The natural, 60-degree "handshake" position puts less pressure on your wrist throughout the day and fits your hand like a glove, whether at home or in the office. Thumbs up for thumb controls Moving between folders or web browser pages is a breeze with large Back/Forward thumb buttons, especially with the extra-comfortable thumb rest. A quiet scroll wheel with great tactile response glides smoothly through long lists. All six buttons on this wireless computer mouse are easy to reach. Advanced, precise tracking with up to 1600 dpi The high-performance optical sensor provides great accuracy for effortless navigation on almost any surface. Switch instantly between accuracy or speed mode tracking at 800, 1200 or 1600 dpi via the top-mount button.