Dual USB Car Charger: 2 USB charging ports can charge most USB devices. 3. Input 3.1A/1A, 1A port, with USB reading and charging function; intelligent 1 charging port, can intelligently identify Android or iOS devices and charge.More Compatibility: Wireless Bluetooth FM Transmitter Adapter for Car Radio, Streaming Calls/MP3 Music/Phone Voice to Car Speakers. Compatible with iPad, iPhone, Samsung, Google, LG, HTC and Bluetooth devices.Hands-free function: Built-in microphone, automatically switch from music playing state to hands-free mode when answering a call. One-click answer/reject/interleave/recall.Car battery voltage function Displays the voltage for 3 seconds when plugged into a car socket port. Always keep your battery healthy. Then it will turn into autoplay mode.Music playback: support Bluetooth/U disk/TF card/MP3/wma player. Adopt anti-jamming performance and CVC technology. Listen to music while charging. Automatically connect to memory pairing when power on.