Only when your device and charging cable support PD protocol, the USB-C port on this fm transmitter can PD fast charge;
Only the USB port with double Lightning mark support QC 3.0 quick charge, and your device and charging cable should also support QC 3.0, the other USB port only support 1.5A and USB Disk driving.
This car stereo bluetooth adapter support bluetooth, USB Disk and TF card to play your music, but when you use them all at the same time, the bluetooth audio will be priority, then the last inserted USB flash driver or TF card
If you want to listen to music in your mobile phone via Bluetooth, please adjust the FM in the car to match the FM of the car charger so that the sound in the mobile phone can be played through the player in the car.