Car Bluetooth 5.0 FM Transmitter MP3 Player Audio Receiver PD 18W QC3.0 USB Fast Charging Handsfree Car Kit FM Modulator Features: -The product is suitable for 12~24V voltage -FM 87.5-108MHz full frequency band -Bluetooth supports music playback, navigation broadcast -Bluetooth hands-free calling for incoming calls, -USB port and TF card slot support 32GB capacity U disk or memory card playback, -support music format MP3 /WMA, lossless sound quality, no noise, anti-interference. M32 with PD:-Supports QC3.0 fast charging protocol, PD charging (does not support PD fast charging) -USB port maximum output current 5V 3.4A M32 without PD: -USB port output current 5V 3.1A+1A Package includes: 1 * Car Handsfree FM Transmitter 1* user manual Dual USB QC3.0+PD Dual USB 3.1A+1A Question and Answer Question 1: What is the FM transmitter? Answer: FM transmitter is a very small FM Radio Transmit Station with a broadcast range of <5 meters. Main function: Transmit the audio to your car FM radio via the same FM bands, Then you can hear this audio in the car speaker. Question 2: Why my car FM Transmitter function is so noisy? Answer: FM Transmitter transmits the FM band in 5 meters. We know the FM radio station is a very wide range, if we set the same band with radio, our signal will affect a lot. So we can follow the steps as below, 1. We adjust our car FM to the band without the radio station, like 108.0MHz. 2. We change our device FM band to the same band with car FM -108.0MHz. 3. We can play music via TF card or Bluetooth, check the quality of sound. Question 3: When playing music, get an incoming call, why the sound volume becomes louder or lower after answering it? Answer: Because the calling volume is controlled by the '' Calls '' and music volume is controlled by '' Media '' in your phone volume settings. So you can modify the settings on your phone to let the sound more comfortable.