In the video below, KCI Communications turns monitors and laptops 17 inches or smaller into a tablet. A small device that acts as a "base station" clips onto the top of the monitor, continuously picking up the user's input with the Duo pen. "The pen's coordinates are calculated by the amount of time it takes for the infrared and ultrasonic waves to be reflected from the base station." The user can write or draw directly on the screen in eight different languages, marking up Web pages, documents, or PowerPoint presentations while using the pen to navigate through the desktop. One of the more remarkable features is that the Duo also converts into a ballpoint pen, letting the user take notes on traditional paper and watch them appear in the included NoteTaker software.