Defibrillator also called as Automated External Defibrillator Machine is a life saving medical device with its light and useful design to apply electrical shock to patient in the event of a sudden cardiac arrest. Automated defibrillators are designed to be used by everyone who didn’t have medical education but got first aid training. Automated defibrillators AED have advanced ECG analysis software, device analyzes ECG signal and guide the user through audible and visual system. Therefore, user doesn’t need to know heart rhythm the AED – automated external defibrillator is a special-design device for first aiders, being used until emergency paramedics arrive to the scene. Early defibrillation application which is a treatment of sudden cardiac arrest may enable heart beat again to maintain circulation and can save life.