Product Wireless Bluetooth FM transmitter The Bluetooth car adapter is easy to connect to the car vent or dashboard, then, adjust the car radio to an unused FM frequency (range from 87.5 to 108 MHz), match this FM transmitter to the same frequency and avoid this Carry the car kit with your mobile phone via Bluetooth. feature Dual USB ports This car Bluetooth adapter has dual USB ports that can charge two devices at the same time. Greatly shorten your charging time Auxiliary input mode The AUX input port makes it possible to transfer music from MP3, MP4 and other audio devices with 3.5MM interface audio cables. Colorful surround lights Press the "M" key to switch the light color, including red/green/blue/yellow-green/purple/cyan/silver and breathing light modes. Two installation methods The product comes with a vent clip and an adhesive base for the car center console, which can be used to mount the monitor on the vent or on a flat surface. read more Please note: 1. Radio interference depends on the local radio signal, and the interference in a bustling city will be more serious. 2. Turn the volume of the car radio and transmitter to medium, and the volume of the mobile phone to high to make the sound quality clearer. read more