Bluetooth Car FM Transmitter & Function CollectionDual USB ports, QC 3.0 quick charge, hands-free calling, voice assistant, high fidelity sound quality output, dual screen and voltage display, 7 colors and 2 modes ambient light, support U disk, TF card and Bluetooth music play modes. We provide one year warranty. If you have any questions, please contact our customer service. Easy to use Plug the Bluetooth FM transmitter into the car cigarette lighter, select an empty FM frequency (range 87, 5 to 108 MHz) on your car radio, connect your phone's bluetooth to the hands-free car kits, then tune to the same frequency. Once successfully paired, it will transmit music from your phone to the car stereo system. In music playing mode, it will automatically switch to phone call mode if there is an incoming call. 18W PD Effective Charging & QC3.0: The Bluetooth adapter car can fast charge two devices simultaneously via PD18W and QC3.0 ports. which charges your devices very quickly Capable of charging compatible devices to 80% in just 35 minutes. The 5V/1A USB port with music icon not only for charging, but also for reading U disk to play your favorite music. 7 Colorful LED Strips: The Bluetooth car adapter for FM transmitter supports 7-color LED backlight, 7-color LED breathing light makes riding more fun, shines to amplify the atmosphere, and also makes it easier to use and ride at night. Equipped with an LED voltmeter that shows you your car battery status to keep you updated on the vehicle status. Dual-screen and voltage displayCompared to d 'other vehicle FM devices, the latest car Bluetooth adapter for the unique dual-screen display design that provides you with more information, not only displays the FM frequency but also the battery voltage, so that you are always informed of battery consumption, allowing you to be more concentrated while driving.