The revolutionary design of the Arc™ Mouse combines the comfort of a desktop mouse and the portability of a notebook mouse. Arc Mouse folds to 60% of its fully expanded size when you’re on the go. Two color options to match your personal style. 1) 2.4 GHz - 30 ft. Wireless Range The 2.4 GHz wireless USB micro-transceiver connects wirelessly right out of the box with virtually no interference and has up to a 30 foot wireless range 2) Folds For Portability Mouse folds to 60% of its fully expanded size using the strong metal hinge. Folding the mouse closed automatically turns it off. 3) Scroll Wheel Save time and effort with the scroll wheel—navigate documents and Web pages without using the on-screen scroll bar. 4) Battery Status Indicator You won`t get caught with a dead battery—the Battery Status LED Indicator glows red when the battery is running low. 5) Snap-in Transceiver :: Computer/Operating System  Windows® 7/Windows Vista®/Windows XP   Hard Drive:  100 MB 2 AAA alkaline batteries required (included)