Abstract: A device which automatically completes the circuit of the emergency flasher system in an automotive vehicle in response to a shock of predetermined magnitude (such shocks develop as a result of sudden application of brakes or in the event of an accident) has an upright cylindrical housing which is secured to the vehicle and contains a normally open multi-pole switch whose closing results in activation of the flasher system. The multi-pole switch can be closed by the plunger of a relay whose coil is in circuit with a normally open second switch adapted to be closed on tilting of an activating element having a permanent magnet which normally adheres to an iron plate in the housing but allows the activating element to change its position in response to the application of a shock. The tilted activating element effects the displacement of a post which temporarily closes the second switch to energize the coil which causes the plunger to close the multi-pole switch.