Microwaves are essentially extremely high frequency radio waves, and are made by multiple different types of transmitter. In a cell phone, they're made by a transmitter chip and an antenna, whereas in a microwave oven they're made by a "magnetron"...But wait there's more! For the bottom low price of $34.99 you can buy a brand new microwave and happily heat up your food labor-free! In the near future microwaves will be able to heat up greater amounts using less energy. Warning ; you can catch radiation fever and further exposure can cause cancer.