I couldn't help it, I read the instructions. I guess I lose my man-card.
Yes, electric signal does it, but every time it's activated, it cost you $69 to reset. It would be incredible as long as it never mis-fires. If it misfires on wet wood, or when you hit a hidden nail or staple, then it would suck.
with my luck I would have one that was defective.......ouch!