Bluetooth, U-Disk, TF card music playing FM transmitter supports Bluetooth play, TF card play (up to 32GB), and U disk play to meet your various needs. Long press the middle button to switch the mode: BT --- USB --- TF. . QC3.0 fast charging port This FM car transmitter has two USB ports for charging, and the maximum output of a single charging port is 5V / 3A. The other USB port can read music files in U disk MP3, WMA, WAV format. . Clear hands-free calling sound Upgraded Bluetooth 5.0 makes it easy to achieve crystal clear hands-free calling. The multi-function button can easily answer/end/reject incoming calls/call up the last number. . Crystal Clear Music Sound CVC noise reduction technology ensures that the transmitter can connect to your device more quickly and consistently, reducing background noise for clearer calls and safer driving. While listening to your own mobile music and audio GPS navigation, the latest noise reduction technology means call and play quality are comparable to a high-quality CD. . LED Display & Colorful Surround Light The vehicle voltage is displayed when the FM transmitter is inserted into the car cigarette lighter. The last paired phone can be automatically connected due to the memory function. In addition, the compact design saves space and ensures access to the shift lever. .