Innovative design， operating by fingers， mini and facile in use.
2 buttons and 1 roller， function as left key， right key and trolley， operated by thumb
Wrist releasing. No mouse pad required， usable on any surface.
Resolution: 800dpi. USB supported.
System Requirements: Windows Me/2000/XP/Windows Vista
Compatible with MS Windows 98/2000/me/XP/Mac OS 9 and above

Operation voltage: DC 5V
Button dynamics pressure: 60g+/-5g