Ask what works offline
Find out whether output, target settings and timers can be changed on the device. An app screenshot alone does not establish which functions depend on a connection.
Keep the region in view
Confirm app-region support, account requirements and the electrical version being sold. Read the supplier privacy information before connecting a device to an account.
Observe the result
A built-in sensor measures at its own location. Keep independent room observations and note automatic cycling. Smart features are conveniences, not a replacement for cleaning or watching for wet surfaces.