The transparent heat-resistant glass lid allows you to see how your rice is cooked. You can see the inside without removing the lid, so you can check the food without letting the steam escape. The whistle will notify you of the cooking process, so you don't have to worry about turning it off. By adding the thickness of the pot, it can boil slowly without adjusting the heat level, and after boiling, the heat-stored heat will keep the rice at a delicious cooking temperature.