iOne LYNX-M9 3-Button USB/PS2 Optical Scroll Mouse iOne LYNX-M9 3-Button PS/2 Optical Scroll Mouse General Features: Black and silver design USB interface 3-button design Scroll Wheel acts as third mouse button Precise Optical Technology 800 dpi resolution Ergonomic design can be used for either your left or right hand! Compact design Regulatory Approvals: FCC