It slightly changes frequency randomly on every zero crossing of the input frequency, so 100Hz FSK modulation effectively. It is enough to slow down your bluetooth and wifi when the door is closed and the radiated power is fully legal (<0.1W IIRC), so the effect should be amplified a lot when the door is open. Long distance flight is already getting close to the limits of what signal integrity you can get, so even a few miliwatts at the drone might be enough to disable the communications with it.

I too would really like to know, and try it too, but getting permission for 800W transmission would be a pain.