Upgraded Version of Classic KM18: New KM18 adds a 1.8 TFT color display, offering a wider visual interface to show incoming phone numbers, track names, FM frequencies, battery voltage, Bluetooth-connected devices, etc QC3.0 & PD Dual USB Charging: This Bluetooth car adapter has 1 PD and 1 QC3.0 port, enabling simultaneous high-speed charging for driver and passenger. Compared with conventional charging methods, its charging speed is 4 times faster Crystal-Clear Hands-free Calls: Nulaxy s Bluetooth car adapter ensures a stable Bluetooth connection, and its built-in echo-cancellation technology effectively reduces background noise. This combination delivers clearer and more smooth hands-free calling experiences for users Music Streaming: Play your favorite songs on the car stereo through three ways: Bluetooth, microSD card, and Aux interface. With microSD, customize via 7 EQ styles (natural/rock/pop/classic/soft/jazz/DBB) and 3 playback modes (repeat all/repeat one/random) Safety Feature: Adhering to the "Safety First" principle, the KM18 Color Bluetooth car adapter is equipped with a voltmeter that displays the real-time condition of your car battery. The normal voltage range is 13.2V to 14.7V when the car is turned on and in motion, and 12.2V to 12.8V when the car is parked and the ignition is turned off.