3-D Ring Mouse: An ultrasonic computer mouse worn on the finger. The curser is used by pointing and moving the index finger. Zooming is done by moving the hand to and away from the screen.
3-D Trackballs: A hand-sized sensor ball device, which is mostly used to move 3-D models. High-tech trackballs provide 6 dfs, three axes of rotation and translation, spring-loaded centering and other various buttons.
3-D Motion Controllers: A motion-sensing device using an optical sensor and an accelerator technology, which produces spatial coordinates by gesture recognition and pointing by the user.
