Targus PAWM10U Wireless Optical Notebook Mouse with Power Management RF Wireless Technology Provides a Clean, Uncluttered Workspace Free From Cables Optical and Digital Technology: Latest Optical Design and Digital Signal Processor Provide High Accuracy and Precision Movement Complete Power Management: Physical On/Off Switch and Sleep Mode Provide Effective Power Management Limited One Year Warranty Compatible with Windows 98, Me, 2000 and XP