1. when I plug in my pen drive to the computer and when i unplug the pen drive to the computer , how to know?
2. When i plug in my pen drive it is not showing any signs of any pen...

It is a high tech pen that when you push the button, a screen will project out of the side of the pen but it will need the owner's fingerprint in order for it to work. It projects a computer screen when pushed.

pen

The light pen is used to draw objects on a CRT computer screen. They are also used to display objects over computer devices.

steel point pen, and before that the quill pen.