ZOLL's AED Plus has 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 rescue with confidence and clarity unmatched by any other AED. [INFORMATION IN ENGLISH] Not pushing hard enough? It will tell you when to push harder. Pushing hard enough? It will say, "Good compressions." Not pushing fast enough? A metronome will lead you to the right rate. It will even show you the depth of each compression. In real time. Not yet started? The AED Plus will tell you to get started. Compressions stopped? It will tell you to continue.