HP 3-Button PS/2 Optical Scroll Mouse (Silver) Hewlett Packard PS/2 3-Button Optical Scroll Mouse General Features: Silver and translucent clear design PS/2 interface 3-buttons Scroll wheel acts as third button Optical design for smooth, accurate tracking on most flat surfaces HP logo is on the top of the mouse Ergonomically designed Regulatory Approvals: FCC CE cULus TUV/GS C-Tick