Abstract: An electrical blinking light indicator device pluggable into an automotive cigarette lighter receptacle to generate a pulsing alarm signal for deterring unauthorized persons from entering or using the automobile. The indicator device includes a rechargeable battery for supplying electrical energy to a light-emitting diode in the absence of automotive electrical power at the cigarette lighter receptable. Circuitry within the device recharges the battery from the automotive power supply during normal vehicle operation.