There are two different power supplies created as part of this project as well — the first generates +5V much like a normal USB plug would have, and the other creates both +5V and -5V.

Automatic switch that disconnects the power to the USB outlet when a USB plug is not inserted into it. Now read: South Africa’s new ZA Plug standard – what you must know Subscribe Show comments ...

The latest version of this device, USB Kill 2.0, purports to do this by rapidly collecting power from the USB power lines (5V, 1A to 3A) and then discharging over 200 volts of DC power to the host ...