FIRST ALERT 4 CHANNEL DVR SURVEILANCE SYSTEM WITH 2 CAMERAS. DVR MODEL:DVARDM0405. Config/record/record-plan. On that page there is the word 'Redundancy' with a click-on square, which can be checked or unchecked. What is that for? Also on that page, there is PreRecord set at 0 sec, which can't be changed. What is that all about? PATRICK
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