An external defibrillator for defibrillating a person, and for receiving resuscitation event data from a transmitting device distinct from the external defibrillator, the transmitting device including a second housing and a second wireless communication module, the external defibrillator comprising: a first housing; an energy storage module in an interior of the first housing for storing an electrical charge; a defibrillation port for guiding via electrodes the electrical charge to the person; a first wireless communication module for establishing a wireless communication link with the second communication module, the first communication module being further adapted to receive wirelessly a data signal transmitted by the second communication module over the communication link, the data signal encoding the resuscitation event data stored in the transmitting device; a memory adapted to store the resuscitation event data that has been decoded from the data signal; a processor configured to: monitor a reception parameter of the communication link while the data signal is being received, and to set an alert flag if the processor determines from the reception parameter that reception of the data signal may be discontinued prematurely; determine an expected amount of time needed for the first communication module to fully receive the data signal; determine an expected amount of time remaining before the receiving of the data signal becomes discontinued; not set the alert flag if the processor determines that the expected amount of time needed for the first communication module to fully receive the data signal is less than the expected amount of time remaining before the receiving of the data signal becomes discontinued; and a user interface capable of outputting an alerting user notification responsive to the alert flag being set. a first housing; an energy storage module in an interior of the first housing for storing an electrical charge; a defibrillation port for guiding via electrodes the electrical charge to the person; a first wireless communication module for establishing a wireless communication link with the second communication module, the first communication module being further adapted to receive wirelessly a data signal transmitted by the second communication module over the communication link, the data signal encoding the resuscitation event data stored in the transmitting device; a memory adapted to store the resuscitation event data that has been decoded from the data signal; a processor configured to: monitor a reception parameter of the communication link while the data signal is being received, and to set an alert flag if the processor determines from the reception parameter that reception of the data signal may be discontinued prematurely; determine an expected amount of time needed for the first communication module to fully receive the data signal; determine an expected amount of time remaining before the receiving of the data signal becomes discontinued; not set the alert flag if the processor determines that the expected amount of time needed for the first communication module to fully receive the data signal is less than the expected amount of time remaining before the receiving of the data signal becomes discontinued; and monitor a reception parameter of the communication link while the data signal is being received, and to set an alert flag if the processor determines from the reception parameter that reception of the data signal may be discontinued prematurely; determine an expected amount of time needed for the first communication module to fully receive the data signal; determine an expected amount of time remaining before the receiving of the data signal becomes discontinued; not set the alert flag if the processor determines that the expected amount of time needed for the first communication module to fully receive the data signal is less than the expected amount of time remaining before the receiving of the data signal becomes discontinued; and a user interface capable of outputting an alerting user notification responsive to the alert flag being set.