Nulaxy KM28 Car bluetooth adapter adopts a big color screen for more information and better visual experience. Now you can read more information such as incoming phone numbers, car battery voltage, FM frequency, track name, etc. In addition, the air vent installation offer you better view angle for your safety. The dual USB charging port enables you to charge 2 devices at the same time. One of them is a QC3.0 fast-charging port, which can charge your device up to 4 times faster than the standard charge. You can charge 80% of your phone battery just in 35 minutes, saving you much more time than average. Besides that, other ports such as TF card slot, AUX port offer you multiple choices so you can choose to play music via USB drive TF card AUX line Bluetooth. Thoroughly Hands-free with Voice Assistant:Transfer all your phone call and audio streaming into wireless through the FM bluetooth transmitter car. You can easily answer / hang up / reject / redial a phone call with the spin button. Enjoy the smart voice control and play with voice assistant. Try to say “Call Mom”, “Get directions home”, “Play some music”, get things done more conveniently and enjoy safe driving. The big microphone of bluetooth transmitter car is able to collect voice effectively, and the CVC/DSP noise cancellation technology can avoid traffic background noise for clearer conversation. What’s more, the BASS/TRE booster button provides 2 modes for you to adjust, just get immersed into your customized music style. 8 Colorful LED Backlit Modes: Long press the light button on the fm transmitter bluetooth for car to enter the light change mode, and then spin the knob to adjust to the light mode you want. There are 7 mono color modes plus 1 color-changing mode, choose any mode you like to decorate your space.