Fully automatic defibrillator 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. Delivers the shock automatically after a 3-second countdown upon detecting a shockable heart rythym. Shock delivery 8 seconds after stopping CPR for a more effective shock.Constant metronome at a rate of at least 100 compressions per minute to comply with the latest best practise guidelines. 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.