[QC3.0 Fast Charging] The FM transmitter has two USB charging ports, a QC3.0/3.4A interface, advanced fast charging technology, which can quickly charge your mobile phone and shorten charging time. No more waiting to charge. [Bluetooth 5.0 Technology] Built-in Bluetooth adapter with high-performance decoding module, wireless 5.0 lossless transmission, eliminates interference, low noise, shocking high-definition sound quality, giving you a better audio experience. [LED Voltage Display] Automatic Bluetooth FM transmitter with LED voltage display, real-time monitoring of voltage data, protects your device more comprehensively. [3 Music Playback Modes] The car charger Bluetooth supports U disk/TF card to play music. Plug and play, enjoy more high-quality high-definition audio sources, suitable for 12-24V mainstream models, suitable for iPhone, iPad, Samsung, tablets and other Bluetooth devices, making your journey more comfortable. [Hands-free Calling & Voice Navigation] Bluetooth transmitter with built-in microphone, one-button answer, hands-free and safer driving. One-button operation, fast, convenient and safe. You can get clear voice navigation via the mobile app to make your driving safer. [Suggestions for Use] 1. Make sure the FM frequency you choose is an empty channel without a local radio signal. 2. You need to set the frequency of the FM transmitter to the same frequency as the car radio. 3. Try setting the car radio's volume to medium to minimize noise pollution. Enjoy crystal-clear audio and fast charging on the go with this versatile Bluetooth FM transmitter. Features QC3.0 fast charging, Bluetooth 5.0 technology, and multiple music playback modes. Stay connected and entertained while driving with hands-free calling and voice navigation.