battery 60 of course terminals 98 will be covered suitably to prevent injury short circuits and ground faults and other electrical hazards switch 66 provides three switching conditions affording control over the mode of operation of beacons 62 64 in one condition that corresponding to a position of a dial or operating lever shown at 72 power to beacons 62 64 is disconnected from battery 60 a representative operating lever is shown in solid lines in position 72 in the depiction of fig4 the operating lever may also be moved to a second position indicated in broken lines at 74 in this position the switch will connect power from battery 60 to beacons 62 64 so that beacons 62 64 are operating in the third condition indicated in broken lines at 76 power is connected to beacons 62 64 through automatic switch 68 beacons 62 64 thus operate responsively to a condition actuating switch 68 automatic switch 68 responds to a condition which a user may wish to monitor in order to cause beacons 62 64 to operate in the example of fig4 switch 68 is a proximity switch having a plunger 78 switch 68 is physically located in an appropriate place on a bracket 10 30 or 50 so that placement of a fire extinguisher in the intended position for storage causes the fire extinguisher to contact and deflect plunger 78 deflection of plunger 78 closes the circuit and beacons 62 64 operate therefore operation of beacons 62 64 is limited to times when a fire extinguisher is actually placed in and supported by.