ERGONOMIC SHAPE - Ergonomically shaped design and soft rubber grips conform to your hand to be naturally comfortable, and the compact size makes it easy to take with you wherever you use your computer—at home, at work, or anywhere else HYPER-FAST SCROLLING - Scroll through long documents or web pages faster and easier. Or press the wheel and shift to click-to-click mode for precise navigation ZERO SETUP REQUIRED - Flexible wired connectivity means you just plug the cable into your USB or PS/2 port - it works right out of the box. CONVENIENT CONTROLS - Easy-to-reach Back/Forward buttons makes moving quickly between documents or browsing your favorite Web sites a breeze PROGRAMMABLE BUTTONS - Configure the buttons to do exactly what you want like switching applications, opening browser windows or jump to full screen while watching videos