If you don't know what a sonic screwdriver is then you have never watched Dr. Who. This one is a replica from the new series. Turns out the prop makers of the show liked the design of the toy version so much they asked for the molds and now the show prop is the same as the toy.
I'm going to put this one in a plexi-glass case and keep it out in my shop. It will have a sign that says "open in case of emergency".