Sudden cardiac arrest is the largest killer in the UK, taking more lives each year than lung cancer, breast cancer, and AIDS combined. It can happen to anyone at any time or place, with 80% of cases occurring outside of a medical setting. The chances of survival from cardiac arrest decreases by 10% for every minute that defibrillation is delayed. While CPR alone has a 5% survival rate, the use of an automated external defibrillator can increase the survival rate to 50%. The HeartSine samaritan PAD is an affordable and easy to use defibrillator designed for public access to help save lives from sudden cardiac arrest.