All these beacons (excepting GPS) are picked up with radio instruments, and the fact that it's radio doesn't alter the way a pilot uses it. Perhaps "functionality" wasn't the right word - how about "usage"? One of the points about VOR is that you know not only the direction of the beacon (and your direction from it) but also your distance (range) from it.
But this is merely semantics. I'm sure you know what it is, and that I also know what it is.