Rosewill RPLC-200

"PI699E2.8P43A-3 REV1.0" is silkscreened on the board.
 * This is a Shenzhen Gongjin Electronics (SGE) P/N.

It is likely this 500Mbps Nano Powerline Wall Mount Adapter.
 * Has a LNK623DG AC/DC Switching Converter.

This product actually supports 500Mbps PHY rates over powerlines.
 * The manual and QIG for the device are dated 2013-01-07.