Semi-automatic defibrillator designed for use by healthcare professionals who are familiar with and can understand ECG (electrocardiogram) readings. Equipped with Real CPR Help® technology to help rescuers perform high-quality CPR. Sensors in the pads lets the AED see your chest compressions so it can guide you to the proper rate and depth with prompts and an on-screen bar gauge. Comes with shock button that needs to be pressed to deliver the shock when guided by the voice prompt. Shock delivery 8 seconds after stopping CPR for a more effective shock.High-resolution full-colour graphic images and text accompany all audio prompts for easy understanding of what to do next. On-screen CPR cycle countdown timer to let you know time remaining in this cycle. On-screen display of elapsed rescue time and number of shocks delivered for critical information that EMS personnel will need to know on arrival.