A4-TECH A4TMYS40974 Mouse A4Tech V-TRACK 80036400 Product Description: A4TECH EVO G9-500F-1 - mouse - 2.4 GHz - black Device Type: Mouse Connectivity Technology: Wireless - 2.4 GHz Colour: Black Wireless Receiver: USB wireless receiver Movement Detection Technology: Optical Buttons Qty: 4 Movement Resolution: 2000 dpi Performance: 125/250/500 reports per second Features: Sensitivity adjustment, 2X Button, customizable report rate, V-Track technology OS Required: Microsoft Windows 98 Second Edition, Microsoft Windows XP Media Center Edition 2005, Microsoft Windows 2000/ME/XP/Vista/7 Manufacturer Warranty: 2-year warranty