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Use a Bluetooth headset with your Mac
Use a Bluetooth enabled headset to hear and input audio. After you connect your Mac with the headset and select it as your sound input device, it acts as your computer’s microphone and speakers.
Make your headset discoverable to connect it with your Mac (see the documentation that came with your headset).
Click the Bluetooth status icon in the menu bar, choose the headset you want to use, then choose Connect.
The headset is automatically used as the sound input and output device for your computer.
If the Bluetooth status icon isn’t visible, choose Apple menu 
> System Preferences, click Bluetooth, then select “Show Bluetooth in menu bar.”