Stream Stereo Music to Your Car: The FM transmitter uses FM radio signal to connect to your car radio. Just one simple connection step, you can stream your favorite music/audio to your car with no aux port. You can stream music to your car via Blutooth 5.1/USB flash drive/TF card. WMA MP3 WAV music formats are all supported. And CVC technology built in, which enables you amazing Stereo sound. Hands Free Calling: After connected, you can just press the button to answer or hang up your calling. The connection is stable and the voice is clear. You can also use your voice assistant on your phone or use voice navigation as normal. Fast Charger: With the built in PD20W and QC3.0 fast charger, you can get your phone fully charged at amazing speed. Car Battery Voltage Detection: Once plug in, the FM transmitter will display your car's voltage at first. It will help you to monitor the health of your car battery and keep safe of your car. Adjustable LED Ambient Light EQ Bass Sound Model: The color LED ambient light will bring you great music atmosphere and you can enjoy the fantastic deep bass by press the EQ model button.