This Thingy is very simple, it lets you connect two 15-pin 1.0mm pitch cables end-to-end and extend the length. It does the funky pin rearranging and all for you, so just snap those two cables in. Carefully pry the two ears of the connectors, plug the cables with contacts pointing up, and then push the ears back in for a solid connection.
TECHNICAL DETAILS
Product Dimensions: 25.0mm x 17.0mm x 4.2mm / 1.0" x 0.7" x 0.2"