[ThePythonicCow]

Isn’t that kinda like a microwave oven?

Well, the other way around. The microwave oven converts electricity to heat (there are -many- ways to do that.) This new device converts heat to electricity.

[AlexW]

“The microwave oven converts electricity to heat”

Not exactly. The microwaves excite their target (THE FOOD) which in turn generates heat as the food molecules go into orgasm.

The microwaves themselves are not radiating heat.