These power cords receive special approval from UL which is based on high quality construction and peak performance. The Green Dot marking on the face of the plug indicates the cord has been tested and is ready for use in a hospital environment. These Hospital Grade power cords are the standard cords for any medical equipment, (from x-ray machines, to life support equipment, to hospital use). This up angle power cord is ideal for use in confined spaces because it eliminates stress placed on the conductors and strain relief. The definition of an up angle connector is that when facing the equipment with the connector installed ground-pin-up, the cord trails up and away from the equipment. The 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!