The Model F4 not support TF card playback.
JaJaBor Bluetooth 5.0 Car FM Transmitter MP3 Player Wireless Handsfree Car Kit Receiver Adapter with PD USB Phone Charger
Features:
1. Bluetooth answering, hanging up, rejecting, redialing and other functions.
2. Support Bluetooth stereo music playback.
3. Digital LED display.
4. Support car battery voltage detection.
5. Support U disk playback (MAX64G).
6. Support colorful atmosphere light display.
7. Support MP3/WMA format music.
8. Support FM full frequency point transmission function 87.5-108.0MHZ.
9. Automatic power-off memory function.
10. U disk port supports 5V/1A mobile phone charging.
11. Support 5V/3.1A mobile phone charging.
12. Support mobile phone navigation voice prompt.
13. Support charging recognition
Specification:
Bluetooth version: V 5.0
Material: ABS
Play mode: FM transmitter
Effective distance: ≤10m
Size: 87*37.8*50 MM
Applicable model: for 12V-24V large and small cars can be used
Package include:
1*FM transmitter car charger
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.
