JaJaBor FM Transmitter car music MP3 Player 3.5mm AUX Audio Receiver Type C PD 30W fast chargingHandsfree Bluetooth Car Kit Product features: FM full-frequency point transmission 87.5-108MHz. PD30W fast charging battery voltage detection. Support Bluetooth music playback and Bluetooth hands-free call. LED screen, which can display frequency point, song serial number and working status information. Support folder switch play function, song classification play. Support power-off memory function. Two mobile phones charge at the same time, and support charging while listening to music. Noise cancellation function and built-in noise cancellation circuit make the call sound clearer. Product parameters: Screen: LED screen Power supply mode: cigarette lighter power supply USB output: PD 30W 5V 2.4A Power supply: DC12-24V Supported file types: MP3/WMA/WAV/FLAC Working current: 50-100mA DC12V FM frequency range: 87.5-108MHz Working temperature: 0 - 60 Applicable model: DC12V-24V-40V universal Launch distance<5m Package Included:1* car fm transmitter 1* User Manual 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.