[Product Information]

Easy to use: Simply plug into cigarette lighter socket. Control directly as an FM transmitter. Volume, frequency and song control through turn knob, Bluetooth hands-free calling, charging for your phone.
FM Transmitter Radio Adapter: wirelessly stream high quality audio to the car FM stereo system via Bluetooth connection to compatible devices. You can also insert U disk or micro SD card to play the MP3 file. FM 87.5-108.0MHz full channels covered.(The sound would be better if you tune the channel to 106.0~108.0)
Hands-free Phone Call: the built-in microphone provides you with an amazing hands-free function after connecting with cell phone via Bluetooth. Automatically switch to hands-free mode from music playing status when receiving a call. Make driving be easier and safer
Low Voltage Alarm: compact design with LED display monitoring the voltage of your car battery. When car voltage is less than 12V, warning with flashing number on the display
Dual USB Ports: one 5V/2.1A USB charging port to get your phone full charged in short time, the other is designed for reading USB flash drive’s audio files(can not charge)