Power Supply: 2 AAA batteries required. (included) System Requirement: IBM PC or Compatible Mac USB connection Windows or Mac OS X 10.5+ Features: Antimicrobial surface protection 100% waterproof and dishwasher-safe Wireless convenience (USB wireless receiver included) Powerful and reliable 2.4 GHz performance Fast scrolling with frictionless scroll system Superior comfort and feel Perfect for notebooks, netbooks and desktops