Features: 1. [Clearer Calls Based on Enhanced Dual Mics] The 2 microphones work in tandem to collect your voice from all directions, while the latest CVC 8.0 noise reduction technology blocks out more road noise, wind noise and other distractions. Thus ensuring that both you and the caller can hear very clearly. Simply press the call button and enjoy easy hands-free calling and safer driving 2. [48W PD&QC 3.0 Fast Charging]JOYROOM Bluetooth FM Transmitter is equipped with PD 30W Type-C and QC3.0 18W USB charging port, fast charging two devices at the same time. Support Samsung super fast charging and ipad pro-iphone-Google-Moto-LG-Android device fast charging. This 48W high power car adapter charges faster than 99% of Bluetooth car adapters on the market 3. [Upgraded Bluetooth 5.3] JOYROOM FM transmitter uses the latest Bluetooth 5.3 technology, optimizing the transmission delay and connection defect problems of the old Bluetooth 5.1. Bluetooth 5.3 will bring you a faster, more stable and smarter connection with less sound quality loss. Uninterrupted calls and music experience. It takes only 1 second to complete pairing, and no need to repeat pairing after the first successful pairing with your device 4. [Hi-Fi Deep Bass & AUX Mode] Just press the button "b" and you will enjoy powerful deep bass and immersive stereo sound. The high-fidelity Hi-Fi sound quality will also make the music more dynamic and pleasing to the ear, taking your passion for music to a new level. In addition, this Bluetooth car adapter supports AUX connection and USB stick connection, so you can connect your FM transmitter to your car via the included AUX cable and enjoy the CD-like sound quality. 5. [Safe Protections & Universal Bluetooth Car Adapter ]Passed CE, FCC and RoHS certifications. Multiple protections for overcurrent, overvoltage, overload, overheat and short circuit. Compatible with most smartphones and Bluetooth-enabled devices. Such as iPhone-iPad Pro-Samsung-Google-MP3 player-Android phone. Fit 12-24V car cigarette lighter (car, suv, truck, etc.) 6. [How to connect for the best sound] 1.Tune the car radio to an UNUSED STATION(Support 88.1-107.9 Mhz) 2.Pair FM transmitter with car radio channel 3.Pair your phone with FM transmitter via bluetooth. Tip: UNUSED STATION-BLANK CHANNEL refers to station with no music or vocals , just rustling Functional paramenters: 1.Dual microphones 2.Working status indicator 3.BASS button 4.AUX port 5.Light button 6.Multifunctional button 7.Negative power contact 8.Positive power contact 9.LED display 10.Type-C 30W charging port 11.QC3.0 18w charging port 12.USB flash drive port.(This port is mainly used to connect USB flash deive to play music, so the charging speed is slow, it is not recommended to use this port for charging.)