the connection mechanism while the other end remains free when the beacons are stacked up the rod is activated by the cover of the beacon immediately underneath and indirectly activates the switch which carries out a cut off of the supply to the circuitry of the beacon in order to give a greater understanding in so far as that which has been set out some drawings are included in which are schematic and only by way of an example which are not limiting a practical case of its carrying out is represented fig1 is an exploded view of a signalling beacon which is the object of the invention fig2 is a block circuit diagram of the signalling beacon in fig1 fig3 shows the electronic circuit diagram for the control of the luminous indicators of the signalling beacon in fig1 likewise of the receiver decoder circuit of same and fig4 shows electronic circuit diagram of the transmitter encoder of the beacon in the invention as can be seen in fig1 the signalling beacon 1 which is the object of the invention is made up of a cover 2 for the protection of the interior of the beacon a photovoltaic cell 3 a printed circuit plate 4 where all the circuitry associated with the beacon 1 is to.