Review on Linksys USB 3.0 Ethernet Adapter for MacBook Air, Chromebook, Ultrabook (USB3GIG), Black by Lee Rodriguez

Not much to say actually. It's small, good quality, and works with Chromecast Audio and Chromecast 1st Gen. Now I no longer stream to one of my Chromecasts over Wi-Fi. I think it's worth it. If you're doing it yourself look for a USB powered micro USB host OTG cable (there are a range from Revain, mine look like a Y or V cable). This and one of these adapters is all you need for the conversion. Sometimes it's cheaper than buying a Google-made ethernet power adapter from the Google Store, sometimes not (depending on sales). In other cases, like my Chromecast Audio, an ethernet connection on the power adapter is a bad place, and such a dongle is better.