about this article Update Bluetooth Version 5.0- The Bluetooth V5.0 FM transmitter is equipped with a metal frame and a built-in microphone with CVC noise reduction technology. Create full-duplex sound quality for hands-free voice and navigation voice announcements. Full FM radio frequency range from 87.5 to 108.0 MHz is wider than conventional transmitters. Fast and Safe Charging- This FM transmitter has two USB charging ports, one supports 3.0 fast charging and the other supports 1A charging, which is faster and more efficient. It can charge two devices at the same time and has overcharge protection. 7 LED Color Design- The bluetooth FM transmitter is designed with 7 LED color lights, you can see the button clearly in the dark and adjust the color you like. It automatically turns on and displays your car's battery level. Make night driving easier to use and safe to drive. Hands-Free Calling- Bluetooth 5.0 transmission technology enables fast connection and stable signal. Automatically connect and pair when turned on. With the rotary function button, you can easily select FM channels and play/pause/answer/end calls. Wide Compatibility- This upgraded FM transmitter supports playing music via Bluetooth, TF card, U disk. It will automatically detect and play MP3/WMA/FLAC/WAV/APE music.