I ordered two more pieces to replace the "used up" ones. Try searching Youtube for videos on this topic and you will be amazed at the number of views. If your video is gaining from tens of thousands to hundreds of millions of views, payments under the monetization program will replenish the family budget quite well. When I started writing a review, I found a link to https://jiji.ng/37-keyboards/digital another store, checked that the photos match (version 5.8). In Russian, "free energy generator" sounds somehow not very nice, the English term is much more interesting: "free energy generator". It seems to be free and at the same time free. Now the link is not working. They lay for three years, while gathering his thoughts. And then in the comments, the reader aitchzed wrote that the seller was sending another board, asked how to set it up. In our time, the main purpose of making such generators is to make a profit from Youtube.

DIY blog, or Do it yourself – page [5]

Controller boards "616 mini" (green, Ver. 5.8), two pieces, I bought from the link in December 2018.