I have all of your knowledge but could fit in your hands. What am I?

Question

I stare at you, you stare at me.I have three eyes, yet can't see.Every time I blink, I give you commands.You do as you are told, with your feet and hands.What am I?

Answer 1

The ans is Your brain.

Answer 2

Pen

it can be fit in our hand and can give the output whatever the information we have in brain