The car charger uses the voltage in your car's cigarette socket. You should know that in some types of cars this socket is only active when the key is inserted.
Even if your car allows you to charge with the engine off, this always carries the risk of draining your car battery, so be careful, especially with high-powered chargers, how long you use them to charge or get a handy power bank for these cases as well.
In the case of a car charging adapter, in addition to sufficient power and output connectors to suit your needs, you should also focus on the durability of the design and the measurements. It's practical if the charger fits into the dashboard so that it doesn't get in the way and is made of durable metal.