These High Voltage, High Current power cords are the recommended cords used for entertainment, networking, laboratory, and industrial equipment using the IEC-60320-C14 inlet. The plug end inserts only into the NEMA 5-20R style wall outlet or receptacle. The IEC Auto-Lock C13 is an internal mechanism that holds the pins of the C14 Plug or Inlet to keep your device from being accidentally unplugged! These components are sturdy yet unplug with ease whenever you want to remove the power cord!