1.Support FM full frequency transmitting function 87.5-108.0MHZ 2.Support dot matrix screen display 1.3 inch 3.Support U disk playback function 4.Support TF card playback function 5.Bluetooth answer, hang up, refuse to answer, redial calls and other functions Rated working voltage:12V-24V Limited working voltage:8-27V USB output:Dual USB output 5V/3.1A Operating temperature:0-50 degrees Charge recognition:USB2 support 5V/2.1A Voltage detection accuracy:+_1V Signal-to-noise ratio:Greater than 60dB Distortion:Less than0.1% Frequency Response:20Hz-15Khz Left and right channel separation:Greater than 60dB Bluetooth version:Version4.0+EDR Bluetooth sound processing:A2DP (Advance Audio Distribution Profile) function Bluetooth transmission distance:Less than 10M Effective Bluetooth microphone range:0.5-2M FM Transmitting Frequency:87.5-108.0MHZ Transmit FM Mode:Stereo Digital PLL Frequency Lock Support Bluetooth stereo music playback Echo cancellation and noise suppression (CVC) technology when talking Support dual USB output voltage, power supply to other devices, output a total of 5V/3.1A Automatic power-off memory function Support charging recognition Support MP3/WMA format music playback Support multi-language selection Support display contrast adjustment Support electric frequency voltage detection Display:LCD Colour:Black Material:PC+ABS Package Contents: 1 * main unit +3.5mm audio connection cable