There is a USB port in my car, but hated how slow the charging was and that using a GPS app like Google maps would drain my Samsung Galaxy S8's battery to nothing. I took a chance and bought this charger because it said it was quick charge compatible. I can absolutely confirm that this is true! Now I can use any app I want and the battery still charges. It charges my cell from in the car just as fast as the home wall charger. Even if I forget to charge my phone at night, it can be fully charged on my commute. I have had the charger for several days now and it is still working great!!! One of the best purchases I ever made.