about this project Dual USB Fast Charging Ports & 180 Degree Rotation: The car bluetooth adapter is designed with two fast charging ports. One is QC3.0, and the other is the music playback port, which not only supports music mode, but also supports fast charging. QC 3.0 USB ports are four times faster than standard charging ports. In addition, the cigarette holder can be adjusted up and down 90 degrees, which is convenient to install on various models, and it is clear at a glance. 1.8-inch LCD screen, 7 equalizers can be set: Equipped with a large TFT display, you can clearly see all the data even in the dark. You can choose the sound quality of different equalizers according to your preference. There are 7 kinds of various coat, pop, jazz, classic, soft, natural, deep bass and custom smoother, allowing you to set your favorite sound quality and enjoy lossless multi-level bass or 3D stereo music in drive-in theater. Music Mode and Hands-Free Calling: Bluetooth Car FM Transmitter. It uses the most advanced Bluetooth 5.0 chip to increase the transmission speed for a fast and stable connection. After the Bluetooth pairing is completed, the second startup will automatically connect. DSP and A2DP noise reduction stereo processing technology are adopted to greatly reduce external environmental noise such as engine noise and wind noise, making the call stress-free and comfortable hands-free calling. Screen display: When the car Bluetooth FM transmitter is connected, it will automatically detect the car battery voltage, allowing you to know the status of the car battery at any time. When starting up, you can easily and comfortably display the car voltage and FM frequency on the screen, ensuring safe travel. Wide Compatibility: The car transmitter is compatible with 12-24V cars, and the car bluetooth adapter supports 3 music playback methods: MP3, MP4 player/MicroSD card, TF card/U disk, let the soothing music relax. Support Android and IOS systems.