The Performance Mouse MXTM, with Logitech most advanced tracking technology, puts the power to achieve in your hands. The Darkfield Laser Sensor--a Logitech exclusive--tracks flawlessly where optical and standard laser mice fail, working virtually anywhere--even on glass. This sculpted, right hand shape mouse includes hyper-fast scrolling and four programmable thumb buttons, so you'll get more done--more quickly. The mouse connects with ease by simply popping the tiny Logitech UnifyingTM receiver in your computer, delivering long-range, advanced 2.4 GHz wireless connectivity. Plus, the battery is rechargeable.