The Cardiac Science Powerheart G3 AED Pediatric Defibrillation pads are polarized. The defibrillation pads should be placed exactly as shown in the diagram. These electrodes are designed for use with the Powerheart AED G3 Pro on children or infants up to 8 yrs. old, or up to 55 lbs. They use disposable, non-polarized and interchangeable defibrillation electrode pads. Pads attenuate energy to 50J (joules) for a child or infant.Read Less-