Logitech MX Master Frequently Asked Questions Manual page 39

After you've installed Logitech Options, open it, and in the lower right corner, click Add Devices. In the
Add a device window, in the right pane under Set up a Bluetooth device, you should see a message
letting you know whether or not your computer supports Bluetooth Smart devices.
If your computer doesn't support Bluetooth Low Energy, you can still use your device using Logitech's
Unifying technology. Click Add Unifying Device and follow the on-screen instructions.
Check directly in the computer advanced settings
On a Mac
As a general rule, your Mac should support Bluetooth Low Energy (Bluetooth 4.0) if you have a:

MacBook (early 2015 and later)

MacBook Air (mid-2012 and later)

MacBook Pro (mid-2012 and later)

Mac mini (mid-2011 and later)

iMac (late 2012 and later)

Mac Pro (late 2013 and later)
You can also check in the advanced settings:

Go to Apple Menu > About This Mac > System Report

Click on Hardware > Bluetooth

Check the LMP Version:
o If the value is 4.0 (0x6) or greater then the Mac supports Bluetooth Low Energy.