Zoll AED Plus is an automated external defibrillator that features Real CPR Help, a CPR feedback tool that is able to actually see what you are doing and provide feedback to help you do it well. Audio and visual prompts help you to rescue with a confidence and clarity unmatched by any other AED.
It will tell you when to push harder and when compression is good. If you are not pushing fast enough a metronome will lead you to the right rate. It will even show you the real time depth of each compression.
The AED Plus tells you when to get started and when compression is done.