Bluetooth, U disk, TF card music playback The FM transmitter supports Bluetooth playback, TF card playback (up to 32GB), and 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, and the maximum output of a single charging port is 5V/3A. Another USB interface can read music files in U disk MP3, WMA, WAV format.Clear Hands-Free Call SoundUpgraded Bluetooth 5.0 makes it easy to achieve clear hands-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 and more consistently, reducing background noise for clearer calls and safer driving. The latest noise-canceling technology means call and playback quality rivals that of a high-quality CD when listening to your own mobile music and audio GPS navigation.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. In addition, the compact design saves space and ensures easy access to the gear lever.