Number of button:3, usb port;
Interface: USB, PS/2,U+P;
Resolution: 800dpi;
High-precision optical sensor;
Never needs cleaning;
Plug and play, no need the driver;
Moving on most surfaces including wood, plastic, paint etc;
Any color available;
Retractable mouse cable;
Fit for left and right user;
Key life over: > 3 million times;
Ergonomic design to reduce RSI, comfortably touch; 
