Dark silver Logitech Trackman corded trackball mouse - new in unopened box. Connectivity Technology PS/2, USB. Special Feature Ergonomic Design Movement Detection Technology Trackball with 4 buttons. Sculpted ambidexterous shape supports right or left hand. Reduces the need to move your hand to control the cursor. Flexible wired connectivity means you just plug the cable into your USB or PS/2 port - it works right out of the box. Compatible with most Windows and Mac computers. Programmable Controls - Configurable buttons