A4-TECH A4TMYS43971 Mouse A4Tech V-Track 80036400 Product Description: A4Tech V-Track G3-200N - 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: 3 Movement Resolution: 1000 dpi Features: Scrolling wheel, Nano wireless receiver, V-Track technology Battery: AA type OS Required: Microsoft Windows 98 Second Edition, Microsoft Windows 2000, Microsoft Windows Millennium Edition, Microsoft Windows XP, Microsoft Windows 7, Microsoft Windows XP Media Center Edition 2005, Microsoft Windows Vista Manufacturer Warranty: 2-year warranty