Following the URL at the bottom of one of the pictures:
The product appears to be $4.50 per unit:
https://www.alibaba.com/product-detail/detail_1601431242454.html
The same product without advertised translation is the same price:
They deliberately try to hide which app this uses. (Different set of “translation” headphones from the same company)
After about a half hour of research, the app they pair with this is:
The app is no longer available on Google Play
It used to be here:
https://play.google.com/store/apps/details?id=ai.xrion.aicool&hl=en_CA
I have a very strong opinion of this company, but after reviewing the information, you can decide for yourself.