I ordered a USB to Ethernet (rj45) adapter, in order to make the internet / network speed at my MK808II Android Mini PC faster and more stable. But, the one I received was even slower than the wifi-connection! A little (too late) research found out that a lot of these USB to Ethernet adapters are super-slow. But, I found a review of 3 adapters, and one of them is super-fast!
So, if you want such an adapter, check this review. I haven’t ordered this one yet, but if I do, I will post a review.