[Upgraded Version of Classic KM18]: The new KM18 features an upgraded 1.8-inch TFT color display screen, providing a wider visual interface for displaying more information such as incoming phone number, track name, FM frequency, battery voltage, and Bluetooth connected device.[QC3.0 & 5V/2.4A Dual USB Charging]: This Bluetooth car adapter includes a 5V/2.4A port and a QC3.0 charging port to enable simultaneous fast charging for both driver and passenger. The charging speed is up to 4 times faster than standard charging.[Crystal Clear Hands-Free Calls]: Enjoy stable connections and enhanced call quality with echo cancellation technology that reduces background noise for clearer hands-free conversations.[Music Streaming]: Stream music through Bluetooth, microSD card, or Aux input. Customize your listening experience with 5 EQ settings (Normal, Classic, Pop, Rock, Jazz) and 4 playback modes (Repeat All, Repeat One, Random, Folder) when using a microSD card.[Safety Feature]: Safety first. The KM18 includes a built-in voltmeter to monitor your car battery status. Voltage should read between 13.2V and 14.7V when the engine is running, and between 12.2V and 12.8V when the vehicle is off and parked.