With exclusive Darkfield Laser Trackingâ„¢ you can use your mouse virtually anywhereâ€”even on glass. Hyper-fast scrolling lets you fly through long documents and web pages with a single spin of the nearly frictionless scroll wheel. Tiny LogitechÂ® Unifying receiver stays plugged into your computer's USB port and connects up to six compatible devices. 2.4 GHz wireless technology provides reliability and freedom without delays or dropouts. Mouse's sculpted design comfortably fits your hand.