Logitech Ergo M575 Wireless Trackball Mouse Optical 2000 dpi Black

Minimize movement and maximize comfort with ERGO M575 – a wireless trackball with a sculpted ergonomic shape. With no need to move your arm to move the cursor, your hand and arm stay relaxed. The efficient, thumb-controlled tracking can be used anywhere, and since it doesn’t need to be moved, ERGO M575 is perfect for cramped workspaces.