looks like its just setting some events, these two lines should clear the anti-select and the anti-right click respectively if pasted into the debug console:

document.body.onselectstart = undefined
document.oncontextmenu = undefined

The feature is often not very well advertised, a pair of bt nc headphone I am looking at seem to not list it prominently despite being, imo, a pretty important feature. Searching by letter might not get you any accurate idea of what does and does not support multipoint.