VicTec Universal In-Car Wireless FM Transmitter with USB Charger for Smartphones and Audio Player with 3.5mm Port, with Hands-free, Music Control Function Adopted high precision SMD crystal oscillator, with more stable performance and longer lifespan With USB charging port (Max output DC 5V/2.4A ), you can enjoy high speed charging while listening music Compatible with many portable devices with 3.5mm plug such as smartphones, tablets, MP3/4 and so on Supports frequency from 88.1 MHz to 107.9 MHz; you can enjoy high-fidelity music with it Hands-free conversations via the car stereo by just touching the answer button on your phone while driving