Abstract: The radio alarm security system, particularly for the protection of persons within a building against intruders, includes a mobile central alarm unit which is provided with a separate power source and is temporarily connectable to at least one charging station, and includes a receiver unit for the radio signals of alarm indicators, with a transmitter unit for producing radio signals for activating alarm generators as well as with an optical and acoustic display device for the received radio signals and at least hand-activatable initiating device for the radio signals activating the alarm generators.