Using this charger is a breeze. Just plug it into your car's accessory socket, which is usually the lighter socket. Then, connect your MP3 player or other USB - charged device to the USB - A female socket on the charger. You're all set to charge your device while on the road. When it comes to safety, make sure your car's engine is running when using the charger to avoid draining the car battery. Also, don't try to use the charger with devices that require a higher voltage or current than it can provide. For maintenance, keep the charger clean and dry. If it gets dirty, you can gently wipe it with a dry cloth. Don't immerse it in water or expose it to extreme temperatures. By following these simple steps, you can enjoy long - lasting performance from your AerPro charger.