1. Bluetooth mode:Put this product into the car cigarette lighter, open the phone Bluetooth, search for the Bluetooth name: BT-CAR Kit, click the connection pairing successfully, and then match the FM frequency. You can listen to music or make a call.Switch : double-click switch bluetooth mode, TF mode and U drive mode2. TF card/U disk mode:Insert the TF card, the car audio automatically plays the music in the TF card.Insert the U disk into the USB port with music symbols, it can play the songs in the U disk.3. FM function:The frequency range of the car MP3 is 87.5-108.0MHZ,4. Colorful ambient lighting (7+1) mode:The seven colors are: green, blue, red, light blue, light green, purple, blue and white.If you need a single color, you can press button, If you need to turn off the light, press the button 8 times to turn off the light.5. Charging function:It supports dual USB charging, single USB maximum current support 5V 3.1APower-off memory:When this product is powered off, it remembers the frequency that is used and the music in TF card that is played before when it is turned down. When this product is restarted again, it will continue play music that you listen to last time.Noise cancelling function, built-in noise cancelling circuit, make the voice clearer.Working voltage: 12-24VDaul USB output: 5V 3.1A/5V 1APlay format: MP3 WAVSNR: more than 60DBDistortion: less than 0.1%Bluetooth version: 5.0Bluetooth sound processing: A2DP (Advanced Audio Distribution Mode) function supportBluetooth transmission distance: 5 metersBluetooth microphone effective distance: 0.5-2 metersFM mode: stereo digital PLL frequency lockcolour: blackMaterial: ABSPackage Contents:1 x Car ChargerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.