Defibrillators; Automated External Defibrillators; Defibrillation electrode pads; Defibrillation accessories, namely, a communications unit to facilitate communication with a server, chargers, display unit for use in conjunction with the defibrillator; Electrode pads for medical use; Medical apparatus and instruments, namely, electrocardiogram sensing apparatus, cardiac rhythm classifiers, cardiac diagnostics equipment and cardiac therapy equipment to improve cardiac performance