The Device log function provides documentation on basic device modifications with these characteristics:

• Device logs are not available on sensors, only on actuators
• Device logs are not visible to User permission
• System rotates last 40 changes. All older changes are dismissed.
• During restart of control unit, those logs are recovered. Please note that hard restart (by power loss) can store only values every 30 minutes.

In App Settings, you can set Collapse all logs in device details or Expand all logs in device details.