Introduction
The UGREEN USB Bluetooth 5.4 Adapter is designed to provide seamless wireless connectivity for your Windows PC. This adapter upgrades your computer with the latest Bluetooth 5.4 technology, enabling connections to a wide range of Bluetooth-enabled devices such as headphones, speakers, mice, keyboards, and game controllers. Enjoy enhanced transmission range, stable connections, and efficient data transfer for a truly wireless experience.

Image: UGREEN USB Bluetooth 5.4 Adapter with external antenna, illustrating 120m transmission range.
Setup Guide
1. Physical Connection
Insert the UGREEN USB Bluetooth 5.4 Adapter into an available USB-A port on your Windows PC or laptop.

Image: Close-up of the UGREEN Bluetooth 5.4 Adapter plugged into a USB port.
2. Driver Installation
The adapter supports different driver installation methods based on your operating system:
- Windows 8.1 / 10 / 11: The adapter is Plug & Play. Drivers will install automatically upon connection.
- Windows 7: A driver installation is required.
Important Note:
- Before installing new drivers, it is crucial to disable any built-in Bluetooth functionality on your computer and uninstall any existing Bluetooth drivers to prevent conflicts.
- If your PC does not have a CD drive, you can download the necessary drivers from the official UGREEN website. Search for your product model (e.g., "USB Bluetooth 5.4 Adapter") in the support section.
General Driver Installation Steps (for Windows 7 or manual installation):
- Download the appropriate driver package from the UGREEN official website.
- Extract the downloaded ZIP file (if applicable).
- Locate and run the "setup.exe" file within the extracted folder.
- Follow the on-screen prompts to complete the installation.
- Restart your computer if prompted.

Image: Diagram showing driver-free support for Windows 8.1/10/11 and driver requirement for Windows 7.
Operating Instructions
1. Pairing Bluetooth Devices
Once the adapter is installed and recognized by your system, you can begin pairing your Bluetooth devices:
- Ensure your Bluetooth device (e.g., headphones, speaker, mouse) is in pairing mode. Refer to your device's manual for specific instructions.
- On your Windows PC, go to "Settings" > "Devices" > "Bluetooth & other devices".
- Turn on Bluetooth (if not already on).
- Click "Add Bluetooth or other device" and select "Bluetooth".
- Select your device from the list and follow any on-screen prompts to complete the pairing process.

Image: Illustration of wide compatibility, showing a PC connected to headphones, smartphone, keyboard, mouse, and game controller.
2. Connecting Multiple Devices
The UGREEN Bluetooth adapter allows you to connect up to 5 different Bluetooth devices simultaneously. This includes combinations of input devices (mouse, keyboard), audio devices (headphones, speakers), and game controllers.
- While multiple devices can be connected, please note that music or audio streams to only one audio device at a time.

Image: Diagram illustrating the connection of up to 5 different Bluetooth devices to a PC via the adapter.
3. Data Transfer
You can use the adapter to transfer files between your PC and other Bluetooth-enabled devices (e.g., smartphones, tablets) instantly.
- Ensure both devices are paired and Bluetooth is enabled.
- On your PC, right-click the file you wish to send, select "Send to" > "Bluetooth device", and choose the target device.
- On the receiving device, accept the incoming file transfer.

Image: Illustration of data transfer from a laptop to a smartphone using the Bluetooth adapter.
Maintenance
- Keep the adapter clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the adapter to extreme temperatures, direct sunlight, or high humidity.
- Store the adapter in a safe place when not in use to prevent loss or damage, especially given its small size.
- Do not attempt to disassemble or repair the adapter yourself. This may void the warranty.

Image: The compact design of the UGREEN Bluetooth adapter, highlighting its portability.
Troubleshooting & FAQ
- Q: My PC can't use the driver CD, how do I install the driver?
- A: If your PC lacks a CD drive, please download the driver from the official UGREEN website. Ensure you search for the correct model (e.g., "USB Bluetooth 5.4 Adapter") in their support section.
- Q: Why do I get a driver error during installation?
- A: A common cause is conflict with existing Bluetooth hardware or drivers. Please disable any built-in Bluetooth on your computer and uninstall all previous Bluetooth drivers before attempting to install the UGREEN adapter's driver.
- Q: Does the Bluetooth dongle support TV or other non-PC devices?
- A: No, this device is designed for Windows computers only. It does not work with Mac OS, Linux, car systems, TVs, or home theater equipment, as these devices typically lack the necessary drivers to support the adapter.
- Q: Can the USB Bluetooth adapter connect to two earphones simultaneously?
- A: While you can connect up to 5 different types of devices simultaneously, only one audio device can stream music or audio at a time.
- Q: Does the USB Bluetooth adapter support voice calls?
- A: Yes, if your Bluetooth headset or audio device includes a microphone function, it will support voice calls through the adapter.
- Q: Can the USB adapter be connected to gaming controllers like PS/XBOX?
- A: It supports PS4, Xbox One S, and later series gaming controllers. However, all Bluetooth devices inherently have some latency (typically less than 250ms). For ultra-low latency and stability, especially critical for competitive gaming, a wired connection or a dedicated 2.4GHz adapter is recommended.
- Q: Are BLE (Bluetooth Low Energy) devices supported?
- A: BLE low energy Bluetooth devices are not compatible with Windows 7 systems but are supported on Windows 8.1 and later operating systems.
Specifications

Image: Detailed product specifications table.
| Feature | Detail |
|---|---|
| Brand | UGREEN |
| Product Name | UGREEN USB Bluetooth 5.4 Adapter |
| Model | Refer to product packaging (e.g., CM591 for Bluetooth 5.3 variant) |
| Bluetooth Standard | Bluetooth 5.4 (Backward compatible with 5.3/5.1/5.0/4.0) |
| Built-in Chip | ATS2851 |
| Transmission Distance | Up to 20 meters (standard model), up to 120 meters (external antenna model in open area) |
| Operating Frequency | 2.400GHz-2.4835GHz |
| Compatible Systems | Windows 8.1/10/11 (Driver-free), Windows 7 (Driver needed) |
| Bluetooth Protocols | HSP, A2DP, AVRCP, DID, GAVDP, IOPT, PAN, HID, GATT, DUN, IOP, ANU, SDP (Comprehensive support for various profiles) |
| Interface | USB-A |
| Package Size | 114mm x 102mm x 8mm |
| Product Net Weight | 4g |
| Weight with Package | 30g |
| Certifications | CE, FCC, SRRC, TELEC, UKCA, IC |

Image: Diagram showing the dimensions of the compact Bluetooth adapter.
User Tips
- For optimal performance, always ensure your PC's operating system is up-to-date.
- If experiencing connection issues, try moving the adapter to a different USB port or closer to the Bluetooth device.
- When connecting multiple devices, remember that only one audio stream is supported at a time.
- For critical applications like gaming where latency is paramount, consider using wired connections or dedicated 2.4GHz wireless solutions for controllers.
- Always disable or uninstall previous Bluetooth drivers before installing new ones to avoid system conflicts.
Warranty and Support
The UGREEN USB Bluetooth 5.4 Adapter comes with a 1-year warranty from the date of purchase, covering manufacturing defects. For warranty claims, technical support, driver downloads, or further assistance, please visit the official UGREEN website or contact their customer service.

Image: Certifications including CE, FCC, and RoHS, indicating product safety and environmental compliance.





