With this option enabled, ToothFairy will show a battery gauge next to the device’s icon in the menu bar:
This can help you see when it’s time to charge the battery, so that it doesn’t run out at an unexpected time.
You can see the precise battery percentage (including separate levels for left and right AirPods) by hovering over the icon to show the tooltip or by Control-clicking the icon to show the menu.
For more information about which devices are able to display their battery level with ToothFairy, see the Requirements section.