Dual USB car charger: 2 USB charging ports to charge most USB Devices. Input 12V/24V. 1.0A USB port can read and charge function; smart QC3.0 charge port that can intelligently identify Android or iPhone devices and charging. More compatibility: Wireless Bluetooth FM transmitter adapter for car radio, transfer calling/MP3 Music/Cellphone voices to the car speaker. Hands free function: Built-in microphone, switch to hands-free mode automatically from music playing status when receiving calls. Answer/Reject/Hand up/Recall all in One key. Music playing: Bluetooth cigarette lighter adapter for music support Bluetooth /USB disk/TF card/ MP3/WMA player. With anti-interference performance and CVC technology.Listening to music while charging.