Abstract: The personal safety radio device is carried by the person to be protected on a mounting device, for instance incorporated in the heel of a work shoe, and includes a transmitter powered by a current source specific to the device, a receiver and an antenna arrangement. In order to ensure a high operational reliability and a long maintenance-free service life at a high range of transmission the device- specific current source is a rechargeable accumulator which may be charged by a generator arrangement including a piezo-electric converter during the operational useage of the device. The piezo-electric converter is so arranged in the work shoe that it is acted on by the weight of the person wearing the work shoe and thus converts the pressure of the weight into electrical energy.