Wireless mouse features a tiny, leave-in receiver and laser tracking that works wherever you do - even on glass. Darkfield Laser Tracking delivers precise cursor control on virtually any surface, even glass tables (4mm minimum thickness) where optical and standard laser mice fail. Hyperfast scrolling lets you fly through long documents and Web pages with a single spin of a nearly frictionless scroll wheel. You'll be able to quickly go back or forward in Web pages with a click of a thumb button. The tiny unifying receiver stays in your notebook so less worry of it being broken or lost. Add up to five more compatible wireless mice and keyboards to the same wireless receiver. Advanced 2.4 GHz wireless provides the reliability of a cord with cordless convenience and freedom for fast data transmission and virtually no delays or dropouts. Compact size lets you take it anywhere. The sculpted design comfortably fits your fingers. Anywhere Mouse MX also includes two AA batteries and a pouch.