Set up a Bluetooth audio device to work with Mac
Bluetooth is a wireless technology that allows your Mac and devices to communicate without using cables.
To use a Bluetooth audio device such as a headset or speakers, you must first connect the device with your Mac, then select the device as your input or output device.
Set up a Bluetooth audio device
Make sure the device is turned on and discoverable.
If you can’t turn on the device or make it discoverable, see the instructions that came with the device.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Hold the pointer over the device in the list on the right, then click Connect.
If the device doesn’t automatically connect, follow the onscreen instructions to set up the device.
You can also connect a Bluetooth device to your Mac by clicking the Bluetooth status icon 
in the menu bar and choosing the device. If the icon isn’t in the menu bar, you can add it using Control Center settings.
Select a Bluetooth audio device as your computer’s input or output device
On your Mac, choose Apple menu
If your device is meant for sound output (for example, headphones), click Output on the right. If your device is meant for sound input (for example, a headset), click Input on the right.
Select the device you want to use in the list of devices.