Excellent and prompt delivery!
Impressive board! This is a little marvelous! Software can be installed in WinXP and above. Search for "GoWin EDA" and install driver, programmer and IDE. I need to buy more of these. They are so simple for configuring; I feel like owning my first Arduino again. Thank you, seller! (but don't forget to buy an USB C-type cable for connecting the board to computer...)