The ZOLL AED Plus® converts compression data instantaneously from the CPR-D-padz and provides an adaptive metronome to help the rescuer with the proper rate and depth, saying "Push harder" or "Good compressions," as needed. It also shows CPR compression depth on the display screen. ZOLL's AED Plus is the only AED that helps the rescuer achieve the correct rate and depth of chest compressions during CPR. No other AED has both these capabilities.