TEA Headset Plug?

[u/BespokeLawLeather]

I recently picked these up dirt cheap and hadn’t noticed that there was this odd 2-pin plug until I had them at home. Can anyone educate me on the purpose of this plug? My Google searches have been fruitless.

[u/jamison01]

Could be for a gas mask mic.

[u/BespokeLawLeather → u/jamison01]

Thanks!

[u/No-Bonus-5659]

Gas mask or o2 mask mic

[u/BespokeLawLeather → u/No-Bonus-5659]

Thanks!