ZOLL® offers automated external defibrillators (AEDs) to meet the needs of a full range of rescuers. When sudden cardiac arrest occurs, the fact is that only half of the victims will need a shock, but all of them will need high-quality cardiopulmonary resuscitation (CPR). ZOLL®  AEDs include Real CPR Help®, which provides real-time CPR feedback on the depth and rate of chest compressions.