Conversion Adapter for PC/PS4/Steam/Switch

This was previously purchased on Amazon. It appears to be no longer sold.
I used this to connect a PS4 controller to my Nintendo Switch, but I no longer have a use for it, so I am selling it.
Main unit only. No instruction manual.
The connection method from the product page is described in the second photo.
Frequently Asked Questions are listed below.

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[Frequently Asked Questions]
Q. I cannot connect some controllers.
A. This product is compatible with controllers for PS5/PS4/PS3/Xbox One S/Switch Pro (arcade sticks are not supported). It may not be compatible with non-genuine controllers.
Also, PS3 controllers cannot enter Bluetooth search mode, so only wired connection is supported. You can play games after connecting to a PC and then disconnecting the cable. Additionally, connection may not be possible with non-genuine PS3 controllers. Please try with a genuine controller.

Q. I cannot connect my Xbox controller.
A. It is not compatible with some XBOX controllers other than Xbox One S. Also, Xbox Series X can only be connected via wired connection.

Q. I cannot connect to Switch.
A. Please set Settings → Controllers and Sensors → Pro Controller Wired Communication to ON on your Switch console beforehand.

Q. The connection frequently disconnects.
A. Please ensure your controller is sufficiently charged. Also, while using this product, make sure there are no iron metal products or WiFi routers nearby. Signal interference may occur.

Q. After connecting with a PS5/PS4 controller, I cannot operate it.
A. After connecting your PS5/PS4 controller to the game console, you need to press the HOME button once to make the game console recognize the connected controller.