This AED's unique graphical interface - pictures combined with text displays and voice prompts - helps rescuers every step of the way. Lights on the pictures draw the rescuer's attention to actions in the proper sequence. Text and voice prompts correspond to the pictures and help the rescuer perform every important life-saving action. These pictures and prompts assure that everything is done in order, and that shocks, if required, are delivered rapidly.<br>Inadequate compression rate and depth are common during CPR. Compressions must be done well to effectively move blood and oxygen. Zoll's Real CPR Help converts compression data instantaneously from the electrodes 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. The AED Plus is the only AED that can see your chest compressions and guide you to the correct rate and depth during CPR. Electrode