Car Bluetooth FM Transmitter: The KM30 Bluetooth Car Adapter provides multiple solutions for your hands-free driving and car stereo streaming. It features a large display that provides a wider visual interface for more information such as incoming phone number, track name, FM frequency, battery voltage, Bluetooth connected devices and more. Stronger Microphone, Better Hands-Free Calls: KM30 adopts a stronger microphone, which greatly amplifies sound reception and enhances sound quality, bringing a higher level of experience. Treble and Bass Music Streaming: You can play music directly from the car radio via Bluetooth/microSD card/Aux output, enjoy free switching between treble and bass modes, the color spectrum is automatically synced with your music. QC3.0 fast charging: Equipped with QC3.0 charging interface, it provides high-speed charging for drivers and passengers, and the charging time is 4 times faster than traditional charging. Bring voice services to your car: You can use Siri or your voice assistant to make calls, send texts or get driving directions so you can keep your eyes on the road. The KM30 brings voice services to your car.