A USB car charger and an FM transmitter are two completely different devices. The USB car charger plugs into the carport and charges the phone. By itself, it does not allow a phone to play music through a car’s stereo. The only way to do that is to add another device, the FM transmitter, to the car charger.
A Mini USB charger allows users to charge portable devices when they are traveling and a wall charger is not available.
The USB Port Car Charger Adapter fits both standard and auxiliary car power outlets
To do so, check that the vehicle plug is 12V-24V compatible and use only Amolese USB car charger accessory (which includes the USB cable adaptor accessory).