Dual USB car charger: 2 USB charging ports can charge most USB devices. Input 12V/24V, 1a port with USB reading and charging function; smart 3. 1 charging port, which can intelligently identify Android or iOS devices and charge. $ More compatibility: wireless Bluetooth FM transmitter adapter for car radio, transfer calls/MP3 music/mobile 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/raise hand/recall. $ Car battery voltage function: display the voltage for 3 seconds when plugged into the car socket. Always keep the battery healthy. Then it goes to auto play mode. $ Music player: support Bluetooth/U disk/TF card/MP3/wma player. With anti-interference performance and CVC technology. Listen to music while charging. Automatic connection and memory pairing after power-on.