Providing high-quality cardiopulmonary resuscitation (CPR) and defibrillation are important components in helping to save someones life from sudden cardiac arrest. Only ZOLL offers innovative Real CPR Help technology, providing real-time feedback for both rate and depth of chest compressions. This allows the rescuer to be confident that he/she is providing the best CPR to a victim of cardiac arrest. The AED Plus is the first and only automated external defibrillator with this revolutionary technology, and guides rescuers through the complete Chain of Survival helping all sudden cardiac arrest victims, not just those who need a shock.