Using the AerPro car charger is easy. First, plug the charger into your car's 12V or 24V lighter socket. Then, connect the 2.0mm plug to your Nokia smartphone. You'll see your phone start charging right away. When using the charger, make sure your car's engine is running to avoid draining the car battery. Also, don't use the charger in wet conditions to prevent any electrical hazards. For maintenance, keep the charger clean and dry. You can use a dry cloth to wipe it if it gets dirty. If you have any problems with the charger, feel free to contact our customer service.