USB cord turns off laptopor wipes it when disconnected

BusKill is a magsafe-style USB dongle that turns off the laptop whenever it's disconnectedlike a Kensington lock but much more versatile. It can even, as the name promises, kill the laptop entirely if so configured.

BusKill is the world's first laptop kill cord, a hardware "dead man's switch" that executes a user-configurable trigger when your machine is physically separated from you.