The Only AED with Real CPR Help When sudden cardiac arrest occurs, the fact is that only half of the victims will need a shock. But all will require cardiopulmonary resuscitation (CPR). You need an automated external defibrillator (AED) that helps you all the time. The ZOLL® AED Plus® is the only AED that can actually see when you are doing CPR and help you do it well. The AED Plus features Real CPR Help®, a unique CPR feedback tool that is able to monitor CPR quality and provide real-time feedback for depth and rate of chest compressions. Audio and visual prompts help you to rescue with a confidence and clarity unmatched by any other AED.