Checking Security Mode from the Tools menu may enable security mode. You can mark events as participating in security mode by checking the checkbox Security in the event properties. When security mode is enabled, the event trigger time is randomly set to plus or minus 30 minutes (settable) from the actual set time. This can give your home a lived in look.
Note that only the following trigger types support the security mode:
Absolute time trigger
Sunrise/Sunset with offset trigger
Absolute time using the conditions
Conditions based on time
Note that the current time offset for the event is displayed next to the event trigger in your event list. If the offset was randomly set to +20 minutes, the event trigger will be followed by:
(Sec: 20)
The offset
time can be set from the General tab in the Options.