Three Options for Streaming MusicThe Cocoda Bluetooth FM Transmitter can freely stream clear stereo music in 3 ways--A. FM transmitter can play music from bluetooth device to car stereo through FM signal; B. Stream music from SD card, support music files such as MP3/WMA/FLAC/WAV/APE; C. Transfer music from USB flash drive ( up to 32GB).2 USB PORTS AND SAFE CHARGINGSupports charging 2 devices at the same time with overcharge protection. One USB port (5V/1A) with music icon can read USB sticks, and the other USB charging port (5V/2.4A) effectively fully charges your smart device. Enjoy streaming in car stereo while charging your smartphone.Handsfree CallingWith this wireless device, you can easily answer/reject/redial calls with handsfree function and enjoy safe driving. CVC technology will suppress noise and wind, creating full-duplex sound quality.Ambient Ring Light and LED DisplayWhen powered on, the ambient light ring light will glow blue, which is convenient for use in the dark environment of the car, and also brings a cheerful atmosphere; easily and comfortably view the volume, car voltage and FM displayed on the LED screen frequency.HandsfreeOne-touch MFB key to answer/redial/hang up or reject calls; switch seamlessly between incoming calls and music.Voice navigationThis FM transmitter supports navigation apps on your phone, so you dont have to look down at your phone to ensure safe driving.Dual USB port chargingWith 2 USB ports (5V-2.4A and 5V-1A), you can charge your 2 devices simultaneously through this FM transmitter while driving.