1.44 Inch LCD Display: The bluetooth FM transmitter has a 1.44 inch screen to better display phone calls, FM channels, music, car battery voltage and more.Noise Cancellation & Hi-Fi Sound Quality: Noise canceling technology suppresses road noise to give you clear, crisp audio for hands-free calls.Flexible Gooseneck and Bluetooth V5.0: The rotatable gooseneck of the radio adapter can provide you with adjustable viewing angle and optimal viewing comfort of the LCD display.Safety Features: Safety First. The KM18 is equipped with a voltmeter to display the condition of your car battery. When your car is up and running, the voltage should be between 13. 2V and 14. 7V. 12. 2V to 12. 8V When your car is parked and the ignition is off.Wide Compatibility: The car FM transmitter bluetooth is compatible with most devices in the market, such as iPad, iPhone, iPod, HTC, Galaxy, Sony, MP3 players, tablets and Android smartphones.