The technical characteristics of the headphones can be found on the packaging, in the accompanying documentation, in forums and various test sites, as well as in product descriptions in online stores. Of course, they contain useful information, but to a layman these are often just numbers, so it seems that the higher those numbers, the better.
Finally, it's worth finding out what these numbers mean, what are the main features, and which are just a tribute to fashion and the marketing gods.
Let's take a look at the main features of headphones that will help you make the right choice of a specific headphone model that matches your musical preferences and the stereo you are using.
https://bazedon.com/headphone-characteristics-reading-and-understanding-them