External defibrillator is a life-saving machine, but this machine has several characteristics: 1, easy to carry; 2, can analyze special heart rhythm, such as analysis of ventricular fibrillation, can also defibrillate this rhythm, and the defibrillation process does not require human intervention, but automatic analysis, automatic charging, we just press the button on the line, this is the automatic external defibrillator. Most of the automatic external defibrillator use steps: 1, open the power button, open the power button, there are voice prompts, follow the voice prompts; 2, connect the electrode, plug, the electrode is connected to the patient, the machine will automatically analyze the patient, analyze the rhythm, if it is ventricular fibrillation, the need for electric shock, the machine automatically charge the two electrodes, when the charge is good, the crowd are When the charge is ready, all the people leave the patient, ensure the safety, directly press the yellow flashing light, then the electric shock defibrillation.