【Car Bluetooth FM Transmitter】: bluetooth car adapter provides multi-solutions for your hands-free driving and in-car stereo streaming. It features a big display screen offering a wider visual interface for more information, such as incoming phone number, track name, FM frequency, battery voltage, Bluetooth connected device and more. 【Stronger Microphone for Better Hands-free Calls】: KM30 utilizes stronger microphone, greatly amplify sound reception and strengthen sound quality, bringing a higher level of experience. 【Treble Bass Music Streaming】: You can stream music directly from your car radio via Bluetooth / microSD card / Aux out, and enjoy free switching between treble and bass mode, the color spectrum auto-syncs with your music. 【QC3.0 Fast Charging】: It Comes with a QC3.0 charging port to deliver high-speed charging to driver and passenger, the charging time is 4 times faster than conventional charging. 【Bring Voice Service in Your Car】: You can stay fully focused on the road by using Siri or Voice Assistant to make phone calls, send texts or get driving directions.