This standard provides minimum labeling, performance, and safety requirements for cardiac defibrillator devices, and includes referee test methods by which compliance can be verified. Specifically, this standard addresses: a) conventional defibrillators for use in hospitals, clinics, physicians' offices, and emergency medical services; b) defibrillators with an integrated cardiac monitor or attached to an external cardiac monitor-defibrillator; c) defibrillators that are line-powered or battery-powered; d) defibrillators with special controls and circuitry intended for synchronized cardioversion, i.e., the treatment of ventricular tachycardia or atrial fibrillation by means of an electric shock synchronized with ventricular contractions; e) external transcutaneous pacers that are a part of a defibrillator-pacer instrument; f) self-adhesive single- or multiple-function (defibrillation/monitoring/pacing) electrodes.