"""
The first version of USB Killer was consist of a DC/DC converter, a few caps and an FET. When plugged into a system, the converter in the USB Killer would charge the caps up to -110V, apply that voltage to signal lines of the USB interface, and repeat the entire process until everything possible in the computer is broken down.

However, the second version of USB Killer dump -220V directly onto the signal lines of the USB interface, which is powerful enough to damage practically any computer with a USB port.

Another major improvement in the new version of USB Killer is the reaction rate. Once plugged into a computer, USB Killer 2.0 takes only a few seconds for the PC to shut down and stop working.
"""