This is actually a lot more sophisticated than the comments here are making it out to be. With something like this you can basically get software defined cooking. If you combine it with computer vision and a bit of chemistry, you would get a perfect medium rare steak every time. (You don't need the computer vision part if you can get the RF feedback from the sensors directly) To be fair, there is nothing stopping you from doing this with a traditional magnetron microwave, just that you will need a lot of space for hardware and waveguides to have the same precision and control.