Targus PAWM20U Wireless Optical Notebook Mouse Wirless Freedom: 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 Rechargeable: Includes a Battery Charging Cradle for Easy and Continuous Recharging 1 channel / 64 IDs 3-button with scroller wheel