VicTec Car Bluetooth Wireless FM Transmitter Dual USB Charger Hands-free Calling, Music Volume Control for iPhone 7/7s Plus HTC 10 MP3 MP4 With this FM transmitter, you can listen to music from your devices through the car stereo in your vehicle Built-in microphone allows you answer calls through the car stereo for hand-free conversation while driving Dual USB port allows you charge your cell phone and tablet simultaneously (with One 2.4A MAX output) High precision SMD crystal oscillator for more stable performance and longer lifespan Built-in 3.5mm audio port allows you play music from non-Bluetooth devices such as MP3, MP4, and other old style cell phones