Kensington USB Slim Blade Trackball K72327JP Black

It saves space because there is no need to move the main body like a mouse. In addition to the normal view mode, it has 3 modes: a view mode that allows you to zoom in/out the image, and a media mode that allows you to forward/backward tracks. User-friendly design that reduces wrist strain during long hours of work An advanced trackball that offers unprecedented enjoyment in a variety of situations. Large trackball with multi-functions! Easily scroll by just twisting the ball Speaker connection method: USB Symmetrical design for any handedness You can download the driver and assign functions to the four buttons. Controls: DPI adjustment, navigation buttons, scroll wheel