The current technology of the jack plug was invented by Tivadar Puskás, a Hungarian engineer who made the telephone exchange.
He visited and convinced Edison that the telephone a novel device which needed to be made available to the public. From the autumn of 1876 to the summer of 1877 Puskás worked with Edison on the idea of the telephone exchange at the Edison's laboratory in Menlo Park. In the summer of 1877, Puskás as Edison's European agent moved to London and in 1878 to Paris, where he directed the installation of the first telephone network and exchange. The exchange could connect telephone users with the 6.35 mm (1/4 inch) plug.
After this the plug was made smaller until the recently 2.5 mm plug was made. This plug breaks easaly but you can find them in some connection cables for on or over ear headphones.
The current plug technology works by soldering wires to the plug (on right side) and covering that with hard plastic. This results in the hard part that sticks out of your phone while listening to music.
We have started to develop the idea of removing the hard part of the connection in 2013. It took us almost 2 years to develop the technology to the point where we had a proof of concept. This mainly took so long because of our lengthy iteration cycle, due to long ordering time of complicated small parts.
We have been working on moving from prototype made in The Netherlands towards manufacturing. This step was difficult for the technology because of various technical aspects that have implications on the design. The progress has taken a half year to a year with multiple iteration steps. The product is now ready for scaling to mass production at one of the most high end factories where other famous brands manufacture their audio equipment.
We have done extensive testing on the plug. Below you see the swing test of one of our prototypes. Our swing test results score more than 2x better than any other plugs.