These are indeed very small! The paddles are soldered onto a circuit board and the board is insterted into a 3D-printed holder. The assembled version comes with a case which is basically a 3D-printed sleeve to protect the paddles when stowed. I also ordered the cable. The both came with an adjustment tool to carefully bend the paddles in or out as a way of adjusting the feel of the paddles. He also sells a version with the male plug instead of the female jack, in case that fits your setup better.
After playing with them for a little bit, I have to say I really like them! No, they don't feel like a $200 set of paddles. But, then they only cost $24! They are perfect for backpacking, POTA (my use), SOTA (not in Texas!) or any other ultralight station bag. I'm a sucker for cool, lightweight, micro gadgets and these certainly fit the bill!