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The alarm detects sudden voltage drops of the battery when the interior trunk or hood lights are switched on. To ensure correct operation a number of control indications have been included such as : flashing LED to indicate that the alarm is in standby mode after a set time (after you have left the car). Prealarm (builtin buzzer) to indicate that the alarm is activated so that you will not forget to switch it off. The alarm is easy to switch on and off either automatically or by means of the ignition switch or a remote control unit.