How to use one headset on two devices at the same time?

Question

Iron

As usual, I want something strange, namely: to be able to use one wired headset (3.5mm, 4pin) on two devices at the same time . So that at the same time the sound from both devices is "combined", and the microphone is forwarded back and forth.
From the initial data: two devices (laptops) with a 4pin output and a 4pin headset, respectively.

The closest I could find is Nobsound MC1024 , but it can only switch between sources, not simultaneous operation.
I know that some wireless gaming headphones allow this, but I would like to find a more versatile option. Finding comfortable ears is not an easy task.

Are there such solutions in a compact size, and not a whole mixing panel with a separate microphone input and other professional troubles?

Answer 1

Buy a small mixer.

Answer 2

For the microphone - the simplest toggle switch. For sounds - the minimum mixer from AliExpress.
ATTENTION! Computers usually check microphones by the inserted connector, and phones - by electrical connection. If your device responds specifically to the connection, in the NOT used device, connect the microphone to the ground.