AED stands for Automated External Defibrillator. When a sudden blow to the heart occurs, including myocardial infarction, the heart can be defibrillated by electric shock and the heart rhythm can be restored to normal. Especially when out-of-hospital cardiac arrest occurs, most patients initially exhibit ventricular fibrillation, and can be resuscitated early by electric shock defibrillation to minimize neurological damage. In addition, the AED is simple to operate and can automatically determine whether the patient needs shock therapy, and can be used by ordinary people through its voice prompts.