How do I know if my Honeywell Vista 15P/20P is compatible with the Alarm.com System Enhancement Module (SEM)?

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The SEM works on any Vista 15P or 20P that was manufactured in 2005 or later. If you’re unsure about when the panel was produced, it is relatively easy to find. You’ll want to go to the main Vista circuit board and locate the square black plastic processor near the middle of the board. On there you should see some writing printed. Go to the last line and the first thing that you see is the year that the panel was manufactured.