The microwave steamsterilizer is a great way to quickly and effectively sterilize whether you are traveling or at home. It destroys 99% of germs and if it remains unopened, contents remain sterile for 24 hours. Pour water in it and place it in the microwave oven for at least 2 minutes. The closing clamps safely seal the top. Its side handles do not get hot so it is safe to use. A microwave oven is needed for operation.