by a user fig8 shows an example electrical circuit 801 used to power the light emitting diodes 705 and 709 in this example the light emitting diodes are connected in series and are powered using battery set 809 the light emitting diodes 705 and 709 are turned on and off using a magnetic switch 715 placed in series with the light emitting diodes 705 and 709 and battery set 809 when there is no magnetic stimulation the magnetic switch 715 is closed and the light emitting diodes emit light when a magnetic field is present in the vicinity of the magnetic switch 715 the magnetic switch opens the electrical circuit 801 and the light emitting diodes cannot emit light bringing a permanent magnet 805 close to the magnetic switch 715 can generate a magnetic field and interrupt the circuit the electrical circuit 801 can also be equipped with an intermittent switch 807 causing the light emitting diodes to emit flashes of light instead of a continuous luminous flux this mode of operation is more noticeable to an observer while consuming less power this intermittent switch can in some cases be integrated in one of the light emitting diodes such as light emitting diode 705 the secondary vertices can be equipped with similar circuits as described in fig8 to allow the secondary vertices to also emit light thereby improving the visibility of the safety marker in another embodiment the magnetic switch is replaced by a mechanical switch during stowage a portion of the marker abuts a pressure switch for the.