Off-Table Mini USB Track Mouse- Elegant and ergonomic design. Plug and play. Mini size and light weight, easy to carry. Off-table for free and convenient operation. Can avoid eye fatigue and radiation harm. Compatible with Windows 95/2000/7/8/XP. Can be operated in various ways, avoiding harm to palm joint or muscle. Users don't have to sit close to the screen when using this track mouse. Can control the cross coordinate sensitivity simply with the thumb.