Car Bluetooth FM Transmitter: KM30 car Bluetooth transmitter 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 microphones, 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 voice assistant to make phone calls, send texts or get driving directions. KM30 brings voice service to your car.