Maybe it depends on the iPad, but it works for me (iPad Pro, 11 inch, 14.1), adjust sound from headphones: swipe from top right brings up sound settings (and others)).
I have a Oneplus 7 pro.
& I have the same problem. My headphones with this adapter are recognised as a USB device instead of headphones. So I need the one that comes with it from OP & I have another one from 4smarts that works fine.
Yes, this adapter works if you plug it into an Apple multiport adapter. It can easily be used via the USB-C connection of the multiport to connect 3.5 mm headphones.
In general, you are right, most products are offered at a lower price than by the brand itself. However, it is always possible that product prices deviate upwards from the manufacturer's prices.
It is quite possible that the price will be adjusted. Unfortunately, we don't have any more precise information on this at the moment.
I used this for Apple iPad Pro 2018 model, which has connectivity type C, whereas for 2021 model connectivity type is lightning.
Theoretically it should not work...I am not expert... it might work :-)
Hello I cannot confirm this, the 3-pole Bose headphones do not work for me at all. The 4-pole headphones work without any noise. Now I have plugged the 3-pole headphones into my laptop and they work fine. I think I also have a problem with the original Apple adapter.
Unfortunately, I don't have such a headset, so I can't judge it. But if it works with the normal jack of older iPhones, it should also work with newer ones with this adapter.