Product Parameters: Name: usb bluetooth FM transmitter Model: W3 Bluetooth version: 5.3 Audio interface; USB-C/3.5mmAUX Product material: ABS material Transmission distance: 10m Transmission mode: receive/transmit Packaging accessories; Bluetooth adapter, 3.5mm audio cable, USB-C cable Features： 1. Bluetooth 5.3 Stable transmission---Newly upgraded Bluetooth 5.3 chip, more stable multi-data transmission Wider wireless coverage. 2. TF card plug and play---Patented one-piece card slot design.Compatible with various brands of TF card can be used. 3. AUX+FM Output---Support two outputs in receive mode, just to bring a better product experience. 4. With LED design---Can clearly display the status of listening channel anytime and anywhere. 5. Universal for all models---After connecting for the first time, turn off the vehicle and start it again.The device will automatically boot back to the connection. 6. Suitable for all kinds of mainstream vehicles, FM87.5~108MHZ adjustable. Usb interface: The usb interface is used for power supply. When using it, you can plug this product into the usb interface with an output voltage of 5V, for example: the car comes with a usb interface (5V), and the car charger interface (5V). Precautions: 1. The default frequency band of W3 is 95.0MHZ, which can be used directly. If there is a lot of playback noise, it can be adjusted to other frequency bands. 2. When the radio of some models is turned on, the car's built-in usb interface will be powered off. At this time, if the W3 is plugged into the built-in USB port, it cannot be used. In this case, you can plug the W3 into the usb of the cigarette lighter and car charger. The power supply is used on the interface (the output voltage of usb must be 5V). 3. W3 is used in some original cars with usb interface, which may be too noisy or unusable. It is recommended to plug FM02 into the cigarette lighter car charger for use. 4. W3 has no automatic shutdown function, it is recommended to unplug it from the usb interface when not in use. 5. When the W3 cannot be searched in the Bluetooth settings of the mobile phone or cannot be paired after being searched and clicked, it is recommended that you clear the previously connected Bluetooth devices in the mobile phone, and then restart the mobile phone and try again. Packing list: 1x Bluetooth 5.3 Audio Adapter 1x AUX line 1x User Manual