[Upgraded Version of Classic KM18]: New KM18 Upgraded with 1.8 TFT color display screen, offers a wider visual interface for more information, such as incoming phone number, track name, FM frequency, battery voltage, Bluetooth connected device and more. [QC3.0 & 5V/2.4A Dual USB Charging]: The Bluetooth car adapter comes with a 5V/2.4A and a QC3.0 charging port to deliver simultaneous high-speed charging to driver and passenger, the charging time is 4 times faster than conventional charging. [Crystal Hands-free Calls]: provides a stable connection and echo-cancellation reduces background noise for better hands-free calls. [Music Streaming]: Play favorite songs on car stereo through Bluetooth / microSD card / Aux . You can customize music from 5 EQ styles (normal, classic, pop, rock and jazz) and 4 music playback modes (Repeat All/ One/ Random/ Folder) in micorSD Card. [Safety Feature]: Safety first. KM18 Color is equipped with a voltmeter to show you the condition of your car battery. Voltage should be between 13. 2V to 14. 7V when your car is on and moving. 12. 2V to 12. 8V when your car is parked and ignition is off.