1.Dual USB Ports : Bluetooth Car Charger with 2 USB charging port to charge most USB devices,you can charge 2 devices(IOS or Android ) simultaneously. One USB port music icon is for reading USB disk but also charge your device.2.Hands-Free Calls: FM Bluetooth Transmitter adapter built-in microphone to automatically switch from music playing to hands-free mode when answering a phone call. One press to answer/hang up the call. Convenient and safe for driving.3.High Quality : The FM transmitter more stable FM signal,adopted advanced noise canceling technology-CVC technology creates full-duplex sound and suppresses noise and wind, improved the using experience,better anti-interference performance.4. Universal Compatibility : Wireless fm transmitter supporting mobile's A2DP function, work with SD, TF card and USB,listening to music when charging.Compatible for iPad,iPhone,Samsung,Google,LG,tablets,Andorid or other device with Bluetooth connectivity.5.Easy operation : The Bluetooth FM transmitter simply plug into the car cigarette lighter and pair it with car radio or smartphone.Then it could be automatically searched and connected to your device next time,if the device had been connected before.