? 2.4GHz wireless reliability & performance via nano receiver small enough to plug in & leave connected;? Scroll wheel makes it easy to scroll within web browser or documents--no need to move mouse;? Back/forward buttons to navigate between pages in browser;? Windows(R) 8 home button;? Compatible with Windows(R) XP & higher, Mac(R) OS X(R) 10.1 & higher & linux(R) kernel 2.6 & higher;? Blue LED technology to navigate with precision & control on virtually any surface, including glass, granite countertops, hardwood floor, carpeting & more;? Ergonomic design--contoured shape with easy-grip surface makes computing comfortable for hours;? 1-year limited warranty;? Graphite;