Click on the Help button ❔ next to the Settings ⚙️ button > select ' ℹ️ About' (1). A new dialog will pop up with the Calendar Pro 'Unique Identifier' (2) Related ArticlesHow can I connect my Calendar Pro with Map Pro?How to find the Booking Room Pro ID?How to get the Calendar Pro version?How to get Parking Pro version?How to check the Parking Pro Unique Identifier (ID)?