ACCURATE OPTICAL SENSOR & STURDY CONSTRUCTION DELIVER RELIABLE PERFORMANCEBASIC 3-BUTTON WITH SCROLL WHEEL CONFIGURATIONIDEAL FOR NEW SYSTEMS REPLACEMENTS & UPGRADESCOMPACT SIZE ERGONOMIC & AMBIDEXTROUS DESIGN OFFERS COMFORTABLE GRIP WITH LESS FATIGUELOW-FRICTION BASE SMOOTHLY GLIDES OVER WORK SURFACESPLUG & PLAY INSTALLATIONCOMPATIBLE WITH WINDOWSLIFETIME WARRANTYUPC : 766623177016Shipping Dimensions : 5.00in X 3.60in X 1.60inEstimated Shipping Weight : 0.25