Advantages: Charge 2 different devices at once!! Listen to your favorite music from your USB flash drive or micro SD card! It can also be used as a hands-free car while driving. The device transmits the signal wirelessly, there is no need to modify anything in the car. Functions: Support Bluetooth hands-free phone call through built-in microphone Noise and wind are suppressed by CVC technology for full two-way sound quality Support A2DP function of mobile phone. The music will be played directly when the mobile phone is connected The mobile phone can be connected automatically when the device turns on Support external TF card, you can play MP3/WMA format music files 7 different lighting colors are available Frequencies: FM: 87.5-108.0 MHz Transmitted power: 87 dBuv / 107 dBuv Effective distance: 2m