Press the adapter’s pairing button anywhere between 5-10 seconds. Check the adapter’s manual for the specific time, as it may differ depending on the brand. Press the adapter’s pairing button. (From: YouTube/Avantree) Press your headphones’ pairing button to allow it to connect to the adapter.
Find a free USB port on your computer. You'll need an empty USB port into which you can plug your Bluetooth adapter. If your computer uses oval USB-C ports instead of rectangular USB 3.0 ports, you'll also need to buy a USB to USB-C adapter for your computer.

All you do is download the binary and place a shortcut to it in your Startup folder. The binary takes two command line options, the VID&PID values of the Bluetooth dongle. (The instructions are all there.) The program does exactly what the name says, it converts the Logitech Bluetooth dongle from HID (USB) to HCI (Bluetooth) mode!

Bluetooth adapter or Bluetooth dongle is a USB-based wireless device that enables you to receive Bluetooth signals wirelessly to connect with various devices like a TV, home theater, mouse, keyboard, etc. Bluetooth adapters are very helpful for your computer and laptop when you use multiple wireless devices.

What this means is that in theory you should be good with what you have right now. But I'd advise you try the dongle that comes with the evolve 2 first and disabling your built-in bluetooth card to see how the call quality fares. If the dongle doesn't help with the call quality, you can try a direct connection with your built-in card and remove

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how to add bluetooth to pc without adapter