[Efficient FM Bluetooth Transmitter]: The Bluetooth car adapter is equipped with 3 USB ports (PD 36W, QC3.0, 5V/1A), allowing you to charge multiple devices while enjoying music. You can use the USB port for fast charging your phone and insert a USB drive into the 5V/1A port to play music. [Bluetooth 5.3 Technology]: The car Bluetooth transmitter features the latest Bluetooth 5.3 technology, offering a more stable connection and faster, clearer audio transmission. It also has an automatic connection feature, eliminating the need for repeated pairing after the initial successful pairing. [High-Performance Calls]: The car music adapter supports one-touch easy answering/hanging up/rejecting calls, keeping your hands on the wheel and making your drive safer. With CVC noise reduction technology, it effectively suppresses road noise, providing you with clear calls. (Recommendation: Set the volume to 18 or below.) [2 Playback Modes]: The car charger supports 2 playback modes: you can insert a USB drive (≤64GB) to play music or stream music wirelessly from your phone via Bluetooth. It supports multiple music formats, including MP3/WMA/APE/FLAC/WAV, allowing you to enjoy your favorite music while driving. [Simple Operation & Multiple Protection]: The FM transmitter is very easy to set up. Long press the previous/next track buttons to adjust the frequency, and use the knob to adjust the volume.