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06A02 is a datecode for Jan 2002, IIRC.There's no relay and the cable does certainly appear to be OEM. My best guess is that it is an RF to PLC transceiver with a serial output.
In the photos the power supply sure looks like the one you are asking about.https://www.ebay.com/itm/Radio-Shack-Color-Video-Wireless-Observation-System-SECURITY-CAMERA-2-4GHz/122977327885?hash=item1ca2051b0d:g:0eIAAOSwDfNai6bQ