Note:Q: If your Bluetooth adapter does not work (there is a driver error problem), please use the following methods to solve it. A: Since Windows 10 system has Bluetooth function which is the "Intel(R) Wireless Bluetooth" in this image， So you need to right-click to disable the Bluetooth: "Intel(R) Wireless Bluetooth" and then re-plug our 5.3 Bluetooth adapter to try， If you have other questions, you can contact our online customer service to solve the problem.
The USB bluetooth adapter can only be plugged into your desktop or laptop computer, and cannot be used on other devices such as a car.
Before using the product, please disable the Bluetooth of the computer itself, and uninstall the existing Bluetooth driver of the computer, and then install the driver of this product.
Bluetooth 5.4 Adapter
Enjoy wireless life fastly
Major Breakthroughs in TechnologyThe latest Bluetooth 5.4 technology, optimizes the transmission delay and connection defect problems of the old Bluetooth 5.0
Multiple Bluetooth Versions
Bluetooth 5.3, backward compatible with 5.1/5.0/4.0 devices
Diver-free for Win8.1 and Later
Only use on Windows computer
Save your USB Ports
Connect 5 devices simultaneously
Bluetooth Connection
Enjoy wireless life
Use for Wireless Keyboard and Mouse
Enjoy wireless working and game
Use for Data Tranfer
Transfer file instantly via to 20M Transmission Distance
Faster and more stable transfer
Strict Safety Control
Each UGREEN product has undergone layers of security testing and passed multiple international security
Clear Indicative Status
Keep lighting when it works
Small & Anti-lost
Product Specifications
Package Display
Q: My PC Can't use this CD, how do I install the driver?
A: If your PC does not have a CD driver, please kindly download the driver from UGREEN official website. it is for free.
Download link: Before using the product, please disable the Bluetooth of the computer itself, and uninstall the existing Bluetooth driver of the computer, and then install the driver of this product
Q: Does the Bluetooth dongle support TV?
A: Sorry, this device will only work when plugged into supported Windows. Even though TVs, home theater equipment, and stereos have USB ports, they don't have the necessary drivers to support this adapter.
Q: Why do I get a driver error when I install the driver?
A: Maybe the built-in Bluetooth on the computer causes a conflict. Please disable the previous Bluetooth first.
Tips:Connect 5 devices wireless via Bluetooth 5.0 dongle at the same time, but music streams to only 1 audio device at a time.
How do I install the driver for Windows?
a. To install the driver, visit the UGREEN website, search “CM390” and download the driver in the "Support" section
d. Open file "UB400_Driver.zip", click through the following “Windows” file and click on “setup.exe” and finish the installation
Q: Can the USB Bluetooth adapter connect to the same device at the same time, such as two earphones?A: No, you can connect 5 devices at the same time, but they must be different types of devices.Q: Does the USB Bluetooth adapter support voice calls?A: If your Bluetooth headset has a microphone function, it supports voice calls.
Q: Can the USB adapter be connected to Gaming Controllers such as PS/XBOX?A: It only supports connected PS4, X BOX ONE S and later series Gaming Controllers. Bluetooth devices all have latency issues（Latency
