This is a conversion adapter made by "Kaden no Ken-chan". This is a finished product. It allows you to connect a PlayStation 1 controller (e.g., NeGcon) to a Switch. The condition is very clean. I connected it once to check the power, but it didn't work well with my controller (non-NeGcon, arcade stick for fighting games), so I'm selling it. I think there's probably no problem with the product itself. Please refer to the information magazine on the "Kaden no Ken-chan" official website for more information on this product. This is an indie product and does not have official support, so please purchase only if you understand the nature of the product.