Targus Wireless Keypad & Mouse Combo (PAKP003U) 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 Faster Data Input: Low-Profile Design Allows for Convenient Data Input; Ideal for Spreadsheets, Accounting and Financial Applications Power Supply: 4 x AAA Alkaline batteries Compatible with Windows 98SE, 2000, ME, XP, with 1 USB port Limited warranty does not cover products purchased from 3rd party sellers