The Comfort Trackball Mouse from Comfort Keyboard is thier newest trackball mouse. Ambidextrous (right or left handed) capacity and a detachable wrist rest make this space-saving mouse alternative an ergonomic masterpiece. Ergonomically contoured and shaped to the human palm, hand, and wrist, the ErgoTrack ergonomic trackball offers professional, drafting-grade resolution weighing in at a full 6400 dots per inch! The Trackball offers a trio of rugged, tactile response keys - you know what we mean... you press, you feel the spring, you hear the click - this is the way trackballs (and everything else) should be made! Along with the scroll lock button, the third key offers fully-programmable features - all software included. Ergonomic, handsome, three micro-switched force feedback keys/buttons - it's hard not to fall for the Comfort Trackball, with compatibility for USB, PS/2, and Serial ports, you're out of excuses! Get one today, and experience the precise motion and fluid control of opti-mechanical technology at its finest. But you've been warned... get the Ergo Trackball, and you may never go back to any other mouse or generic trackball system again!