The Kensington SlimBlade Trackball will make working on your computer easier and faster. A laser sensor tracks every movement to help you move the cursor accurately, and the option of four programmable buttons makes overall PC work easier. Kensington is also ergonomically well thought out, thanks to its low profile. This will make working on the computer healthier. The trackball features Plug& Play, so it can be easily connected with a 150cm USB cable. So you don't have to worry about buying batteries.