Fantasy Pen / Pen

This is a pen without ink. You can use it on any flat surface to write and record things, and even write in the palm of your hand.
But the tip of your written words will not appear in the paper surface or the palm of your hand, but were converted to data stored in the pen inside,
and then through the USB interface, delivered directly to your computer. So, you only need a pen, will be able to record anywhere of any information,
but do not waste a piece of paper and don't need to worry about the pen is out of ink .