Universal 12V warning relay for use where an indication that the lights have been left on is required when you open the vehicle door. Features a piezoelectric buzzer operating at 72db volume and is powered from a +12V input from the headlight switch. The buzzer is triggered by a connection to the door switch that becomes earthed when the door is opened. Terminal C can be connected to an ignition switched live so that the buzzer can be cancelled with the door open by turning the key to the ignition accessory (ACC) position.

Listen to the buzzer sound here