A combination of an automated external defibrillator, AED, and an AED monitoring system comprising: the AED having a self-diagnostic subroutine and adapted to perform said subroutine at regular intervals, the AED having at least an audio indicator that is adapted to indicate the results of the self-diagnostic when the diagnosis is that the AED is in need of maintenance; the AED monitoring system, wherein the AED monitoring system is remote from the AED, the AED monitoring system having a microphone, battery, microprocessor, wireless communication device, and an electromagnetic coil, the coil being a multi-turn coil, the coil capable of detecting an electromagnetic signal generated by the AED when the AED wakes up, wherein in a start-up procedure of the AED monitoring system said system is adapted to detect an electromagnetic signal to establish a time and an interval when the AED conducts a self-diagnostic test; wherein the microprocessor is adapted to wake up the AED monitoring system prior to the AED's self-diagnostic according to the established time and interval; wherein the microprocessor is adapted to monitor the coil at the time of the performance of the self-diagnostic subroutine to verify that the AED is present and that the AED battery is not dead; wherein the microprocessor is adapted to utilize the microphone to monitor for the AED's audio indicator that the AED is in need of maintenance; wherein the microprocessor is adapted to transmit a wireless signal through the wireless communication device to an online monitoring system to indicate whether the AED is in need of maintenance based on the electromagnetic signal from the AED and the audible signal from the AED; and wherein the microprocessor is adapted to move the AED monitoring system from an activate state to a sleep mode after transmitting the wireless signal. the AED having a self-diagnostic subroutine and adapted to perform said subroutine at regular intervals, the AED having at least an audio indicator that is adapted to indicate the results of the self-diagnostic when the diagnosis is that the AED is in need of maintenance; the AED monitoring system, wherein the AED monitoring system is remote from the AED, the AED monitoring system having a microphone, battery, microprocessor, wireless communication device, and an electromagnetic coil, the coil being a multi-turn coil, the coil capable of detecting an electromagnetic signal generated by the AED when the AED wakes up, wherein in a start-up procedure of the AED monitoring system said system is adapted to detect an electromagnetic signal to establish a time and an interval when the AED conducts a self-diagnostic test; wherein the microprocessor is adapted to wake up the AED monitoring system prior to the AED's self-diagnostic according to the established time and interval; wherein the microprocessor is adapted to monitor the coil at the time of the performance of the self-diagnostic subroutine to verify that the AED is present and that the AED battery is not dead; wherein the microprocessor is adapted to utilize the microphone to monitor for the AED's audio indicator that the AED is in need of maintenance; wherein the microprocessor is adapted to transmit a wireless signal through the wireless communication device to an online monitoring system to indicate whether the AED is in need of maintenance based on the electromagnetic signal from the AED and the audible signal from the AED; and wherein the microprocessor is adapted to move the AED monitoring system from an activate state to a sleep mode after transmitting the wireless signal.