ZOLL's AED Pro 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. For the professional rescuer, the AED Pro offers the ability to view a patient's underlying ECG rhythm with See Thru CPR®. When the AED Pro is in manual mode and chest compressions are being performed, See-Thru CPR is activated. See-Thru CPR allows clinicians to see organized electrical activity while compressions are being performed by filtering out compression artifact ("noise"). This enables rescuers to see a patient's underlying cardiac rhythm during resuscitation efforts, which reduces the duration of pauses in CPR.