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And I am curious what those 3 LEDs might indicate - The gadget is only connected to battery and GND through the adapter plug. And what kind of filtering can it provide, when the wires go round and round the car (the adapter is fed through the ignition switch) before getting connected to the ECU? (I doubt whether it is directly or through a distribution panel)
In lighter vein, they should include a vibrator and a rechargeable battery set inside.
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