Try a different USB port or a powered USB hub. Some adapters require more power than a standard keyboard USB port provides.
If you are using the HK-808 for headphones, ensure you are using the AAC or aptX codec. You can check this by holding Option and clicking the Bluetooth icon in the menu bar. Where to Download Official Drivers? Hk-808 Bluetooth Usb Adapter Driver For Mac
While many of these affordable adapters use generic Realtek or Broadcom chipsets, macOS handles them differently than Windows. Here is everything you need to know about setting up your HK-808 on a Mac. Does macOS Support the HK-808? Try a different USB port or a powered USB hub
The HK-808 often utilizes a CSR (Cambridge Silicon Radio) or Realtek chipset. macOS has built-in support for many CSR-based devices. You can check this by holding Option and
The biggest hurdle isn't usually the driver, but the fact that your Mac is trying to use its built-in Bluetooth card instead of the USB adapter. How to Install and Activate the HK-808 on Mac
USB 3.0 ports can sometimes cause interference with 2.4GHz Bluetooth signals. Use a short USB extension cable to move the HK-808 away from the computer's body.
If your Mac has a broken internal Bluetooth card, you must tell the system to prioritize the USB dongle. Open (Command + Space, then type Terminal).