Not familiar with them, or any bluetooth headphones, at all.
But, I do use bluetooth speakers of multiple types.
What I have found is that there are differences in how the controls work depending on the speaker and/or device.
For instance- I have a small, portable speaker that when used on one device, it is best to turn the volume all the way up on the speaker itself and to then control the volume with the device.
This same speaker, however, when used with a different device, will not allow separate controls like that.
If I bring the volume up on the speaker, it automatically brings up the volume of the device- and visa versa.
Also, different devices have different options for bluetooth, and these can be hidden away inside your developer options.
If you have not enabled developer options on your device, you can do a quick search for how to do so, or we can give you the general gist of it here.
Also, if you don't know already, on the devices that I deal with, the volume for bluetooth devices is a separate volume (only accessible when bluetooth is connected) and so does not affect the volume of plug in headphones, the built in speaker, or any other sound option.
(Of course, your device may vary in this regard, but I have not seen one that did yet.)