Calculator.........

Ok, First i would break it open and use the display screen as a razor, I would use the chips to connect my electricity to a metal plate on my floor,a nd the buttons would be used so i don't shock the piss out of my self. I would melt the battery into an arrow head and sling shot it at the when they enter, taking one out, And whatever i have left, I owuld throw at them.

I would probably to the exact same thing with the monitor also.