ZOLL®'s Semi Automatic AED Plus® Defibrillator ZOLL®'s AED Plus® features Real CPR Help, a one-piece pair of electrodes, that is able to evaluate the efficiency of the CPR you are providing. The integrated metronome as well as the vocal and visual prompts help and assist the rescuer during the whole CPR process.; ZOLL® believes an AED should not just deliver a shock.It should also help the rescuer provide high-quality CPR.