Adesso iMouse T40 Wireless Ergonomic Finger Trackball Mouse with Nano USB Receiver, Programmable 7 Button Design, and 5 Level DPI Switch, for Left and Right Hand

The trackball design allows users to use their fingers to move cursors on screen, reducing excessive hand movement. The mouse uses a 2.4 GHz radio frequency, offering a wireless range of up to 30 feet. Every mouse button can be customized to your preferred function with its programmable driver. With its 5 levels of DPI resolution (400 - 4800) The tactile trackball simultaneously provides superior accuracy and smooth motion, reducing hand movement and desk space requirements. Cleaning is simple! Just push the trackball outward from its back, clean it and push it back in place. Its ergonomically contoured large size makes helps relieve wrist pain, which maintaining your productivity.