Dumang DK6 Keyboard
@XahLee the key units are connected together by the mother board. the board is not only for power delivery. something electrical is there in the board that makes the whole thing work together. when i press a layer-switching key, the led on the board lights up. it tells me which layer it is currently in by showing different colours.
btw, i found two big problems with Dumang DK6 recently while trying to configure it for use on mac.
one is, on mac, for any key combos to work, the keys must be on the same board, otherwise it won't work. for example, with dvorak layout, left-cmd c won't work because left-cmd is on the left board and c is on the right. this fortunately can be worked around by installing Karabiner-Elements without further configuration (told by the manufacturer. i installed it and it worked). the cause is mac handles multiple keyboards differently, for Dumang dk6 is a single board keyboard, not a keyboard with two parts split. the feature of "split" i showed last time is actually achieved by connecting two DK6 keyboards to one computer, thus two USB devices.
the other issue is similar with the first one, but happens to the layer switching keys. for example, with fn set to switching to layer 1 on left board, fn+c won't do what you'd configured it to do. this currently has no official solution yet, though there is a user solution by a power user. see the python package here https://pypi.org/project/dumang-ctrl/. the script is written for linux, but the author claims that it also works on mac. i was trying to make it work last weekend but met various errors. i'll try another day to see if it works on mac.
Where to Buy
Official Chinese site http://www.beyondq.com/
Buy at amazon
2020-10-03 thanks to jamesni for photos and info.
If you have a question, put $5 at patreon and message me.