【What's updated】Updated to the latest Bluetooth version -V4.2 + EDR; Long pressing the next song key "►|" for 5 seconds, Bluetooth FM Transmitter will turn off the FM and Bluetooth functions, and keep charging function; Supporting mobile's A2DP function, the FM Modulator can work with Bluetooth, SD Card(MP3, WMA, WAV format), Audio cord; The song name will shown on screen via TF Card Mode; Besides, you can comunicate with Siri by long pressing the button 【Quick Charge 3.0+Smart 2.4A Dual USB Charger】FM Transmitter with QC 3.0 usb car charger, 4x faster than regular chargers, saves your time greatly. The 2.4A usb port delivers the fastest possible charge to all non-quick charge smart phones or tablets. Support charge two devices simultaneously 【Handsfree Calling】Built-in a microphone allows you make hands-free calls when driving. CVC noise cancellation technology helps to promote clarity for both music and hands-free calls. Automatically switch to hands-free mode from music playing when receiving a call 【HIFI Clear Sound Quality】Support Non-destructive sound transmission for music playing via Bluetooth, TF Card and aux cable. Enjoy the crystal clear sound when listening to audio book or Pandora 【Large Screen & Easy Operate】The 1.7 inch LCD display tells you the frequency, volume, incoming phone number, current song information and car battery voltage. The buttons are big and easy to press Hand-Free Calling:It is built-in microphone with Latest Bluetooth 4.2 and CVC noise reduction technology offer you a clear talking. Switch to hands-free mode automatically from music playing status when receiving calls. Answer/Reject/Hand up/Recall all in one keypad. Broad Compatibility:The Car transmitter is compatible with most devices. Such as iPhone 11 Pro XR XS X 8 Plus/7/6S/6 Plus, Motorola, Samsung, LG etc and most Bluetooth-enabled devices. With AUX cable, the car FM transmitter also works with non-Bluetooth devices like MP3 player, old speakers and so on. Dual Ports & QC3.0 Charger:Support charge both devices simultaneously, one is for QC3.0 quick charger. Smart output current pairs your smart device, safely charging to your device without damage to the battery. You can play music in your Bluetooth device or USB flash driver(32GB max). Support MP3/WMA/WAV format. How to adjust the volume to avoid interference? The volume of car radio could reach 1/3 or 1/2, but cannot exceed 2/3. The volume of transmitter could reach 2/3 or 4/5, but try not to reach the full volume. The volume of cellphone could reach 2/3 or 4/5, but try not to reach the full volume. Below are the usage tips: Use Google to find the best blank station near where you live, tune your car radio frequency to an empty channel that Google recommended, and choose the same channel on the transmitter. Turn on the Bluetooth of your phone, search "BT70" and pair. Once it shows connected on the screen, the transmitter is ready to go. Open the music player and enjoy your music.