I almost fell over laughing on this one. The author uses a TP-link TL-MR3020 to play music thru a USB to audio converter. I guess its a cheap low power way to have wireless speakers?
http://pixelatedpic.blogspot.com/2013/07/turning-tp-link-tl-mr3020-into-audio.html
http://dangerousprototypes.com/2013/07/18/turning-a-tp-link-tl-mr3020-into-an-audio-player/