iOne Scorpius P7 compact trackball keyboard w/ optical sensor PS/2 + USB Scorpius P7 - The trackball keyboard has an enhanced slim design, which works with any IBM USB compatible computer This is a classic keyboard with mechanical keyswitch. The Scorpius P7 offers durability and style that will enhance any system for years to come. Great performance in business applications with optical trackball, Standard left and right mouse button function. Requires PS/2 port-equipped PC and Microsoft Windows 95/98/Me/2000/XP/Vista.