A method of wireless communication between a first unit (10) and at least a second unit (12), characterized by the following steps: the at least one second unit (12) responds to activation by transmitting a dealarma at a predetermined first frequency signal, said first unit (10) is in a first receiving mode for a first time period for recibircontinuamente signals from said at least one second unit to a first predetermined frequency, yresponde to receiving the alarm signal transmitting a signal of acknowledgment to said predetermined, said primerafrecuencia, at least, a second unit (12) changes to a second predetermined frequency and transmits unaseñal alarm to said second predetermined frequency, otherwise no acknowledgment signal recibodesde said first unit is received, said first unit (10) repeatedly changes to a second reception mode for reci bir continuamenteseñales from said at least one second unit (12) to said second predetermined frequency yresponde receipt of the alarm signal transmitting signal acknowledgment to said second frecuenciapredeterminada, ydicha first unit (10) remains in said second receiving mode for a second period of time, before switching to said first reception mode.
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