Downloadable computer software and downloadable software applications for providing operator instructions in conjunction with the use of defibrillators during an emergency incident, defibrillator asset management, monitoring or tracking the location, availability or operational status of defibrillators, training on the use of automated external defibrillators (AEDs), cardiopulmonary resuscitation (CPR) training, cardiac incident management and reporting, identifying the location of public access defibrillators, informing responders of the occurrence and location of potential cardiac arrest incidents; Downloadable computer software for collection, storage and transfer of data from defibrillators; Downloadable computer software for interfacing with and displaying instructions from defibrillators; communications modules, namely, electronic communication units for facilitating communications between an external defibrillator and a server sold as a unit with external defibrillators; display modules, namely, electronic display units for use in conjunction with external defibrillators, sold as a unit with external defibrillators; external defibrillator accessories in the nature of display modules, namely, electronic display units for use in conjunction with external defibrillators; external defibrillator accessories in the nature of communications modules, namely, communications units for facilitating communications with a server used in conjunction with external defibrillators; external defibrillators accessories in the nature of data transfer modules, namely, electronic data transfer units for collection, storage and transfer of data from external defibrillators; external defibrillator accessories in the nature of display modules, namely, electronic display units for interfacing with and displaying instructions from external defibrillators; external defibrillation accessories, namely, battery packs, chargers, electronic display units for use in conjunction with external defibrillators

External defibrillators; automated external defibrillators (AEDs); external defibrillators featuring built-in communications hardware and software; defibrillation electrode pads; defibrillator electrode pads; medical apparatus and instruments, namely, electrocardiogram sensing apparatus, cardiac rhythm classifiers, cardiac diagnostics equipment and cardiac therapy equipment to improve cardiac performance