This is the Yamaha YWA-10BL Wireless Network Adapter. The Yamaha YWA-10 wireless network adapter can be used to connect a Yamaha network AV receiver to a wireless home network. The YWA-10 connects to the Ethernet port on the back of your Yamaha network receiver and communicates directly with your wireless router. It's powered by the DC out jack or USB port of the receiver, so there is no need to take up an additional electrical outlet. The YWA-10 even has a second Ethernet output that can be used to provide network access to another device such as a Smart TV or Blu-ray Disc™ player.