Philips HeartStart OnSite AED is ready to act and virtually ready to go. It allows anyone with little or no training to treat the most common cause of suspected sudden cardiac arrest (SCA) by delivering a shock quickly and effectively, wherever SCA happens. The OnSite automated external defibrillator provides practically real-time guidance through step-by-step voice commands from pad placement to performing CPR. This unit is also designed for use with the Philips SMART Pads that will provide feedback to the AED so it can adapt its voice instructions to your actions and your pace. The system won’t announce the next step until you are ready. Prompts are repeated and rephrased if needed and include additional instructions to aid understanding. The system senses when the special Infant/Child SMART Pads cartridge is installed and automatically adjusts CPR instructions and shock energy to a level more appropriate for infants and children under 25 kg or 55 lbs. or 0-8 years old.