The USB Bluetooth Car Adapter adopts Bluetooth 5.3 chip to provide a more stable and faster connection. The Bluetooth transmitter supports Bluetooth playback, TF card playback (up to 32GB), USB flash drive output, 3.5mm AUX output to meet your various needs. Please note: Adjust to 107-108MHz to minimize radio interference. Radio Blur 5.3 for cars, advanced CVC noise reduction technology and built-in microphone provide you with clear wireless calls. In-car FM Bluetooth transmitter allows you to activate Siri or Google Assistant to send messages, play music, get directions, one-touch hands-free for safer driving. This FM Bluetooth 5.3 transmitter features a 1.6'' LED display and flexible gooseneck. Support file option/sound mode, FM frequency display/file category name display. The car radio bluetooth transmitter's rotatable gooseneck provides you with an adjustable viewing angle and optimal viewing comfort. The Bluetooth transmitter is equipped with PD Type-C 30W and QC3.0 USB 18W charging ports, which allows you to charge 2 devices quickly at the same time. The USB port (5V/1A) not only charges, but also reads music files from a USB flash drive, such as WMA, MP3, WAV, APE, FLAC music formats. The Bluetooth transmitter has a built-in safety control chip that provides over-charging protection, over-voltage protection, over-current protection, temperature control, and short-circuit protection.