D-Link Powerline AV 500.  
Model No: DHP-500AV
P/N: BHP500AVA.....A1

In working order; I moved so just not needed any longer.  This listing is for one plug-in device.  At least two plug-in devices are required (one plugged in to router and another where you want to extend/enhance internet access).  I have a second one listed, but it has a different P/N, so it is listed separately.

From manufacturer's product details:
  • Blazing speeds and wired connectivity anywhere in the house, makes this PowerLine AV 500 Adapter Starter Kit ideal for high-bandwidth network-ready devices. The D-Link PowerLine AV 500  uses electrical wiring already in your house to provide fast, reliable speeds of up to 500Mbps. Simply connect one adapter to a power outlet and your router, and then plug the second adapter into another outlet to get instant network connections. Once the devices are plugged in, press the simple connect button on each device to establish a safe, secure connection.
  • Gigabit port for connecting high speed devices
  • Speeds up to 500Mbps
  • Use Your home’s electrical wiring by plugging into existing power outlets
  • Backward Compatible with HomePlug AV devices
  • Push and Secure encryption button
  • Supports 128-bit AES Encryption for Network Security
  • Plug & Play Installation
  • QoS Support Helps Prioritize Internet Traffic

First four pictures are stock photos; the last ones are of the item itself.