[Bluetooth, U disk, TF card music playback] The FM transmitter supports Bluetooth playback, TF card playback (up to 32GB), U disk playback to meet your various needs. Long press the middle button to switch modes: BT---USB---TF. [QC3.0 fast charging port] This FM car transmitter has two USB charging ports, the maximum output of a single charging port is 5V/3A. Clear Hs-Free Call SoundUpgraded Bluetooth 5.0 makes it easy to achieve clear hs-free calls. The multi-function button can easily answer/hang up/reject incoming calls/outgo the last number. Clear Music SoundCVC noise reduction technology ensures that the transmitter can connect to your device faster more consistently, reducing background noise for clearer calls safer driving. LED Display and Colorful Surround LightThe FM transmitter shows the vehicle voltage when plugged into the car cigarette lighter. Thanks to the memory function, the last paired phone can be connected automatically.