It is off-table, without limitation by operation space and avoiding harm to wrist and muscle. The two dimensions and buttons are simply controlled by fingers.
Looking for something a bit different in a mouse? It looks like a lame Sci-Fi gun in a low budget movie, but who knows, it might just help your wrist.
1. Off table and without limitation of operational space
2. 4D page scrolling function can be controlled simply by your thumb
3. Features 3-button design with trackball
4. USB 2.0 interface, plug and play, no software required.
5. Special design, can avoid the harm on your wrist and muscle, greatly reduces discomfort for Arthritis and CTS suffers
6. Easy to use - left or right hand, or cradled between both
7. Mini size, light weight, easy to carry
8. Ideal for both laptops and desktops
9. Color: Black
10. Material: Non-slip soft rubber
11. Place end of index or middle finger on trigger button & thumb on roller ball
12. Suitable for Tablet PC & Laptop & Desktop computer
13. Compatible with Windows 95 version B / 98 / ME / 2000 / XP / NT/WIN7
14. USB Cable length: 2M
15. Package size:11*6*14.3 (CM)
1 X Portable Finger Hand Held 4D Usb Mini Trackball Mouse