Ergonomist-approved mouse-converting design with 60 degree of tilting angle which helps promote more neutral wrist, arm and shoulder alignment, reduce pain and maximize comfort. Best-in-class optical tracking sensor and thumb operated 34mm trackball Thumb-operated mouse-converting trackball that mitigates learning curve for traditional mouse Wireless dual connection via 2.4GHz Nano receive or Bluetooth Plug-and-Play with no driver installation needed