Acco Mouse Optical Pro 4Btn USB USB+PS/2 Optical Blue mice

Kensington Mouse-in-a-Box Optical Pro Optical technology offers better tracking and works on any surface without a mouse mat.
No mouse ball = No moving parts to clean
USB plug and play allows hot swapping and PS/2 for older systems.
Four programmable buttons & scroll wheel to make you more productive
Hi-tech design with tail light & side buttons offer feel the ideal for left & right handed users.
Compatibility:Windows® 98 Apple Mac® OS 8.1 or later (with USB port)