Accuratus Upright Mouse - Optical - Cable - Black, Silver - OEM - USB - 800 dpi - Scroll Wheel. With the Accuratus Upright Mouse the vertical position of your hand makes using this mouse very comfortable for people who work intensively on a computer, it"s a great help, for example, for users with arm, wrist and shoulder problems. As more and more of us find ourselves glued to a desk for 8 hours or more each day, it"s not surprising that an increasing number of us are showing symptoms of RSI (Repetative Strain Injury) and aggravating hand and wrist pain such as Carpal Tunnel Syndrome, two disorders that can be severly aggravated by a poorly laid out workstation.