The voltage of a car charger is 12 V. Car chargers used in automobiles are rated for this voltage. Car chargers are mainly for the convenience of car owners to charge their digital products while driving. Nowadays, cars are equipped with car charging ports, usually with two USB ports, which can charge two digital products at the same time. Car chargers used in cars are rated for voltage. Car chargers are mainly for the convenience of car owners to charge their digital products while driving. Nowadays, cars are equipped with car charging ports, usually with two USB ports, which can charge two digital products at the same time. Generally speaking, the main purpose of using a car charger is to charge your cell phone. Car chargers have overload protection, short circuit protection, high voltage input protection, high temperature protection, and four-fold safety protection, and can be used safely when traveling. The car charger that comes with the car is usually located in the car navigation, and the USB port is beautifully designed and does not take up too much room in the car. There are many types of chargers on the market, including rechargeable alkaline battery chargers, nickel-metal hydride battery chargers, nickel-cadmium battery chargers and so on. When buying a car charger, it is recommended to buy a multi-function charger. There are car chargers that plug into the cigarette lighter in the car, and then there is one that uses a USB cable and adapter to connect a cell phone, MP3, or standard USB interface product to the car's USB power adapter. This connects a lot of plugs and is not very convenient to use.