SPECS

• Brand: UGREEN
• Chemicals of high concern: None
• Origin: China
• Model: CM591 / CM390
• Bluetooth standard: Bluetooth v5.3
• Certifications: CE, FCC, SRRC, TELEC, UKCA, IC
• Package included: Yes

Product Name:

• Bluetooth adapter
• USB Bluetooth 4.0 / 5.0 / 5.3
• Bluetooth Dongle

Guy:

• Bluetooth adapter for computer
• USB Dongle

Functions and uses:

• Bluetooth adapter for PC
• USB Bluetooth Receiver
• Wireless transmitter
• Connection for mouse, keyboard, headphones and stereo audio

Compatibility:

• Bluetooth 5.4, 5.3 and 5.0
• Compatible with Windows 7, 8.1, 10 and 11 (not compatible with other operating systems)

Bluetooth Protocols:

• Bluetooth 5.3: HSP, A2DP, AVRCP, DID, GAVDP, IOPT, PAN, HID
• Bluetooth 5.0: HSP, A2DP, AVRCP, GATT, DID, GAVDP, DUN, IOP, ANU, SDP, HID

Technical characteristics:

• Transmission distance: Up to 20 meters
• Operating frequency: 2.400 GHz - 2.4835 GHz
• Windows Compatible:
  • Bluetooth 5.3: Windows 8.1, 10, 11
  • Bluetooth 5.0: Windows 7, 8.1, 10, 11

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Important notes:

Troubleshooting

Q: Why is my Bluetooth adapter not working or showing a driver error?
A:

1. On Windows 10 and later, the system includes built-in Bluetooth ("Intel(R) Wireless Bluetooth)"). To avoid conflicts, disable this option in Device Manager before connecting the UGREEN adapter.
2. If the problem persists, please contact customer service.

Q: Is this adapter compatible with TV or cars?
A: No. It only works on Windows desktops and laptops.

Q: How do I install the driver if my PC does not have a CD drive?
A: Please download the driver from UGREEN official website:
Download driver
Before installing, disable Bluetooth on your PC and uninstall any previous Bluetooth drivers.

Q: Can the adapter connect multiple devices at once?
A: Yes, you can connect up to 5 devices simultaneously , but only one audio device can transmit sound at a time.

Q: Is it compatible with game controllers like PS/XBOX?
A:

• Compatible with PS4 and Xbox One S or later .
• There may be latency of less than 250ms on Bluetooth. For a lag-free experience, a wired connection or 2.4GHz adapter is recommended.

Q: Does it support Bluetooth Low Energy (BLE)?
A:

• Windows 7: Not compatible with BLE.
• Windows 8.1 and higher: BLE compatible.

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Highlighted Features

🔹 Bluetooth 5.4: Latest generation technology

• Reduces latency and improves stability compared to Bluetooth 5.0.
• Backward compatible (5.1/5.0/4.0).

🔹 Simultaneous connection of up to 5 devices

• Mouse, keyboard, headsets, printers and other Bluetooth devices.

🔹 Fast and stable data transmission

• Range of up to 20 meters .

🔹 LED status indicator

• Light on when in operation.

🔹 Compact and portable design

• Easy to carry and resistant to loss.