Most people prefer to listen to their favorite songs while driving. Different from traditional transmitter before as only 32GB, now you could put more songs to the USB for your long distance driving. When we insert the U disk, it can be transmitted automatically. | You can get clear voice navigation from your phone’s app. It will self-adjust volume for navigation when playing music. No more hassle but full of exploration on your trip. | It 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. |