Tiny ElectraShields are small modules that plug in between a laptop’s power brick and power cord. It will protect your laptop computer and other sensitive electronics that use C6 and C8 power cords from the damaging effects of power surges and spikes. An indicator light lets you know it’s protecting your computer. Following a destructive surge that would have likely damaged your valuable electronics, the indicator light will go out indicating that a surge has occurred and to replace the ElectraShield. There are 2 and 3 prong versions.