It can be operated in various ways to ensure long-term use without harm to wrist or muscle. Avoid sitting closely to the monitor and reduce the harm of radiation and eye fatigue. Off table and without limitation of operational space. X,Y dimension can be controlled sensitively simply with your thumb. Plug and play ,no software required. Fits left and right handed users. PS/2, Serial and USB versions are available. It supports all kinds of interface to IBM/PC. Compatible with Windows95/ 98/ 2000/ ME/ XP/ NT/3.1 Unit Dimensions: 8 x 4 x 5 cm USB Cord Length:190cm