3 MUSIC PLAY MODES: Comsoon FM transmitter can stream clear stereo music freely in 3 ways--A. Bluetooth Connection; B. USB Flash Disk (32G); C. TF Card (32G), Supports MP3/WMA/FLAC/WAV/APE format. EASY to SETUP: Plug this car kit into the cigarette lighter socket, tune your car FM radio to a blank station(87.5-108.0MHz), and adjust this FM transmitter to the same one; Pair with your phone via Bluetooth 4.2, then there you go. 2 USB PORTS & SAFE CHARGING: Supports charging 2 devices simultaneously with overcharge protection. One USB port(5V/1A) with music icon can read USB disk, another USB charging port(5V/2.4A) efficiently gets your smart device fully charged. Enjoy in-car stereo streaming and charge smart phones at the same time. SAFE FOR HANDS-FREE CALL: Built-in microphone frees your hand for calling. Easy to answer/hang up/reject a call/redial the last number/adjust volume via the multifunction button. Automatically switch to hands-free mode from music playing status when coming calls. WIDE COMPATIBILITY & LED DISPLAY: Advanced Bluetooth 4.2, fits for all Bluetooth enabled devices and Android smartphones; Soft and clear LED display screen with the dynamic scanning technology shows volume, car battery voltage, and FM frequency for easy view, and reduces eye fatigue.