The FM transmitter will allow you to enjoy your favorite music in any car stereo that has a radio and with the LEDs will make its interior brighter and more beautiful. It can play songs from a micro SD card or Bluetooth from your device. Listen to everything loud on your stereo speakers! It has a built-in MP3 / WMA decoder, so it can read songs directly from a micro SD card. It can be tuned to the full frequency range with digital control (Digital PLL): FM 87.5MHz – 108.0MHz (step 0.1MHz). Easily select the “cleanest” frequency to pair with your stereo. The digital multi-LED display makes using the FM transmitter easy. Saves the last frequency you used when you turned it off. It also has two USB ports, a USB Type-A with QC function and a USB Type-C, to quickly charge devices with a total output of 38 W and play music. The charging port can charge any device, as it offers 3.4 A of current. It has a microphone and by connecting the FM transmitter to your mobile phone you can make calls by listening clearly and loudly to your interlocutor from the car speakers. Can operate on 12 V or 24 V. Bluetooth Hands-free Car Kit Speak freely with your hands, drive legally and comfortably. Automatically changes mode from music playback to dial-up Listen loudly from your car speakers Once the call is over, music resumes automatically