What is the input devices for microwave device?
...The door? The refrigerator/freezer (though it requires a
manual interface, in which you take the food out of the freezer and
put it in the microwave by hand). Also, the buttons on a microwave
might be considered an input device.
There is no microwave input device in terms of home computers
(with the possible exception of a hack that allowed you to control
it via USB or something, but I've never heard of that being
done).
A cell phone or Blue Tooth device might be considered a
"microwave device," or maybe a 3G or 4G device such as an adapter
or hub. That frequency range of radio waves is considered microwave
energy.