The MANHATTAN MH3 Classic Optical Desktop Mouse with its 800 dpi resolution sensor offers a reliable performance in a sturdy, practical design. Its compact size and ambidextrous shape feature a familiar three-button with scroll wheel configuration ideal for daily computing needs. Easy Installation and Low Maintenance Plug and Play installation and compatibility with Windows 98SE/Me/000/XP/Vista offer quick and easy operation. With no mechanical or rolling parts to wear or fail, the MANHATTAN MH3 Classic Optical Desktop Mouse requires little maintenance to maintain reliable performance. Lifetime Warranty Strict manufacturing standards ensure the highest quality in all MANHATTAN products. All items carry a full Lifetime Warranty the strongest quality commitment anyone can make.