OPT 3BTN TRAV WHEEL MSE 800DPI USB PS/2 The IBM Optical 3-Button Travel Wheel Mouse PS/2 and USB is a compact, lightweight, three-button mouse. Optical technology provides precision control, and no mouse pad is needed. Its small size and cable wrap make it ideal for the mobile professional. This three-button mouse is available in Stealth Black and comes standard with a PS/2 and USB connector. As a USB device, the mobile mouse can be connected to any enabled USB port.