Logitech Ergo M575 Wireless Trackball

Reduce movements and increase comfort with ERGO M575, a wireless trackball with a sophisticated ergonomic shape. Since you don't have to move your arm to move the cursor, your hand and arm stay relaxed. The smooth and responsive thumb control can be used anywhere - and because it doesn't need to be moved - the ERGO M575 is perfect for tight desk spaces.
The ERGO M575 is particularly compact because it does not move to control the cursor. It's perfect for tight workspaces or for those of us with desks full of papers, personal items, and sometimes even a bowl of cereal.