It will be triggered when you enter or leave a specified area. You should consider using the Geoference trigger. The Geoference trigger functionality is equivalent and uses the Google Play services implementation, so it should be more reliable and battery efficient in most cases. The location trigger will use GPS functionality (if enabled) and therefore may cause significant battery consumption. You can configure the location update frequency in the app settings to achieve an appropriate compromise between accuracy and battery consumption.
Example Usage
Triggers
Actions
Constraints
Local variables