The 3M ergonomic mouse moves like a standard optical mouse but you hold it like a joystick.
The see-saw thumb switch at the top of the mouse gives you your left and right mouse clicks, and the third button is under your fingers.

• Clinically proven to reduce muscle strain and discomfort.
• Ergonomic design keeps the arm positioned for natural, comfortable movement.
• Optical technology is reliable and durable.
• Optical sensor has no moving parts to wear out.
• Maintenance free.

Available is 2 sizes, 'Small/Medium' and 'Large' and either wired or wireless.
Measure from the left hand side to the right hand side of your knuckles

70mm - 88mm   'Small/Medium'
88mm - 100mm 'Large'