ZOLL® offers many clinically advanced manual monitor/defibrillators and automated external defibrillators (AEDs) to help improve survival outcomes for victims of sudden cardiac arrest (SCA) and other heart arrhythmias. all ZOLL manual defibrillator devices and AEDs feature some form of CPR feedback that uses text, audio, or graphics to let rescuers know their CPR is meeting the high-quality metrics. Some ZOLL defibrillators feature Real CPR Help® and others feature Intellisense CPR™. All provide real-time coaching and CPR feedback on rate and depth of chest compressions.