SANWA SUPPLY Wireless Trackball, Quiet, 3-Button, Optical, MA-WTB129BK

A trackball is a device that allows you to control the cursor by rolling the ball with your finger. It is a thumb-operated type that can be used in a relaxed state without exerting any force. It has an ergonomic shape that fits comfortably in your palm. It uses a medium-sized 34mm ball that is just right for moving with your thumb. The cursor speed can be switched between four levels: 600, 800, 1200, and 1600 counts. Silent switches are used for the left and right buttons, wheel (scroll) button, and count switch button. The 2.4GHz digital band is resistant to radio interference, allowing stable data communication over a wide range of up to a 10m radius. *Only when there is no radio interference. It comes with a power ON/OFF switch to prevent battery drain when not in use. The receiver can be easily stored by simply inserting it into the back of the mouse. Receiver storage: Yes