SANWA SUPPLY Wireless Ergo Trackball MA-WTB178BK

This wireless trackball has an ergonomic design that puts less strain on your wrists. The new design allows you to lightly place your hand on the side rather than resting it on top, reducing twisting of the wrist. It can be held at a natural angle, so it doesn't put strain on your wrist even when used for long periods of time. A trackball is a device that allows you to control the cursor by rolling the ball with your finger. It uses a medium-sized 34mm ball that is just right for moving with your thumb.