Automatic external defibrillator or automatic external shock, automatic shock, automatic defibrillator, cardiac defibrillator and shock for dummies, etc., is a kind of portable medical equipment, which can diagnose specific cardiac arrhythmia and give shock defibrillation, and it is a medical equipment that can be used by non-professionals for rescuing patients with sudden cardiac death.February 20, 2015, the automatic defibrillator debuted in Hangzhou Street , first aid is expected to realize the golden 3 minutes.