Hello dipesh003,
Thanks for using Apple Support Communities! We understand you are looking for some information regarding the USB-C to headphone adapter. We are happy to help provide some information.
To start, which device are you using this headphone adapter with? There are a few different adapters to use with different devices. For example, the adapter shown in the picture would be so you could connect headphones to a USB-C port on a device such as a MacBook.
If you are attempting to use headphones on an iPhone with a Lightning port, you would want to get a Lightning to headphone adapter. Take a look at the different adapters and how to use them here:
Use Apple headphones with your iPhone, iPad, and iPod
Let us know which device you are using this adapter with and if you have any questions.
Best Regards.