D-Link DCS-4633EV User Manual page 59

Section 3: Configuration
With tamper detection, the camera is capable of detecting incidents such as redirection, blocking or de-focusing, or even spray paint. After making
any changes, click the Save button to save your changes.
Tamper
Enable this to use tamper detection.
Detection:
Trigger
Enter the tamper trigger duration in seconds. The tamper alarm will be
Duration:
triggered only when there is a substantial change in the camera's view for
longer than the trigger duration specified.
D-Link DCS-4633EV User Manual
Tamper
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