As soon as I put the USB charger in the cigarette lighter, several electrical problems came up: The cigarette lighter is located just below the audio system and the volume from the system became scratchy and when I tried to adjust the volume, it dropped way down and wouldn't come back up. The display on the system also dimmed way down. I turned the ignition off, removed the USB charger, disconnected the negative side of the battery, waited 10 minutes, reconnected the battery and everything returned to normal. Your charger could have caused serious damage to my car, hopefully I took it out in time. Thanks for subjecting me to your low quality part.