?WIDELY COMPATIBILITY? - Work with U disk(64G). Fit for most of the smartphones and more devices that equipped with bluetooth function. Besides, it will automatically connect to its memorized paired Bluetooth device when power on. ?Excellent HI-FI Crystal Clear Stereo Sound ?- Noise and wind suppressed by CVC technology to create full duplex sound quality; support MP3 Play, anti- statics design, enjoy the lossless music in your car!. ?FAST PARING & EASY OPERATION?- This upgraded bluetooth fm transmitter designed by highly optimized Bluetooth solution Bluetooth connection is fast and can be automatically connected. More stable connection. ?Hands-FREE CALLING?- Built-in microphone, this Bluetooth FM transmitter enables you to answer, hang up, reject a call or redial the last number with ease. You can use multi-function button controls call and music. ?DUAL USB Port & QUICK 3.0?- Two USB ports for charging devices, It has two USB charging ports, it can charge two devices at the same time and has overcharge protection. One port is Quick Charge 3.0 port, it makes your device get fully charged in a short time.