Features:
* This Bluetooth FM transmitter supports  TF card play (up to 32GB), 3.5mm AUX input, meet your various needs. Note: Adjust to 107-108MHz to decrease the radio interference.
* The Bluetooth transmitter is connected to the cigarette lighter. It has 2 USB ports: 5V/2.4A + QC3.0. With the USB port QC3.0, which charges 4x faster. You can simultaneously charge 2 compatible devices.  
* The vehicle voltage is displayed when the FM transmitter is inserted into the car cigarette lighter and powered on. 7 multi-coloured options create a comfortable and romantic atmosphere in your car to fit your mood. In addition, the last paired phone can be automatically connected.
* Upgraded car FM transmitter with build-in microphone. It will automatically switch from music playing to hands-free talking when answering a phone call, single press the top button to answer / hang up a call, long press to decline, double click to redial the last called number, long press to activate Siri. Convenient one-button control makes driving safer.
* The package comes with an air vent clip and a dashboard dock. You can mount it on the car air vent or stick it on the dashboard. The 1.1-meter cable provided means this device can be used anywhere in the car.

Parameter:
Out Power :15W with 1 port 5V /1A, the other port Qualcomm® Quick Charge3.0
Charging recognition:USB2 with Qualcomm® Quick Charge3.0 protocol
Material : ABS and Metal
Rated Operating Voltage : 12V~24V
Limit working voltage:8-27V
Item Weight : 100g
Item Size : 8*5*4.5cm
USB2 : QC3.0 5V 3A
Supporting TF Card : 1G-32G
Music Format : MP3,WMA,WAV,FLAC,APE
SNR:>60dB
Distortion:<0.1%
Frequency response:20Hz-15Khz
FM : FM87.5~108MHz (Full Frequency)
Resolution of right and left channel:60dB
bluetooth version:5.0+EDR
bluetooth sound processing    :A2DP(Advance Audio Distribution Profile)
bluetooth transmission distance:<10M
Effective distance of bluetooth microphone:0.5-2M
FM frequency:87.5-108.0MHZ
FM mode:Stereo digital PLL  frequency locking