Optical 2.4 GHz Wireless Tilt-Wheel Mouse Model: MPT3100BLU. Features: Optical Sensing Technology, 2.4 GHz Wireless Connectivity, Tilt-Wheel Scrolling, Automatic Wireless Synchronization, Magnetic Stowable Nano Receiver, Scalable DPI and Low Battery Indicator. Package Contents: Optical 2.4 GHz Wireless Tilt-Wheel, Mouse, Nano Receiver and . It has 2 AAA Batteries, Software CD (for Tilt-Wheel Function), User"s Manual and Warranty Information. System Requirements: PC and MAC Compatibles, Windows XP, Vista and 7, Mac OS 10.3 and above(Tilt-Wheel Function is compatible for PC only). An Available USB Port