How to understand if the headphones support simultaneous (!) Playback via wired and wireless mode?

Question

Bluetooth

A similar feature was already found in the marshall major 3 bt headphones and worked amazingly, after the headphone broke down, I began to look for any ears that can be connected via wire and wireless (hybrids), but it turned out that not all headphones can do this. This leads to the question of how to determine if the headphones can play 2 streams from 2 devices at the same time?

Answer 1

Umm... I don't quite understand the question...
You want to play sound on headphones connected in Bluetooth and wire modes...
Immediately the question is: connected to what? What devices are sources (players)?
Is it multiple devices or one? If there are several sources, most likely, what you expected is impossible.
If one device is in the first place, it depends on its capabilities!
If we are talking specifically about the synchronous output of sound from both sources by headphones - here is an option: https://www.amazon.ca/dp/B07MQQS88Q/ref=sspa_dk_de...
Look here - https://www.backbaybrand.com/
And here's another - https://www.jbl.com/gaming/QUANTUM300.html
The feature is called Hybrid bluetooth+wired dual mode