"Self-test capabilities" in devices means:

1. _Built-in test routines_: Devices have pre-programmed test routines to verify functionality.

2. _Automated testing_: Devices can run tests automatically, without human intervention.

3. _Functional verification_: Devices can test their own functions and features to ensure they work correctly.

4. _Error detection_: Devices can detect errors or faults during self-testing.

5. _Diagnostic reporting_: Devices can generate reports or alerts with test results and error information.

6. _Periodic testing_: Devices can perform self-tests at regular intervals, ensuring ongoing functionality.

7. _Power-on self-test (POST)_: Devices can run tests automatically when powered on.

8. _Continuous monitoring_: Devices can continuously monitor their own performance and run self-tests as needed.

Self-test capabilities enable devices to ensure their own functionality and detect errors, reducing reliance on external testing and minimizing downtime.