The steam hole on the lid helps prevents food and liquid from boiling over during the heating process. The sophisticated design allows you to store food items as well as serve food at the table.
The heat resistant glass component/material can be used under 400℃ - It can be put in the refrigerator and freezer and used in the microwave and oven safely.
If your web browser happens to be Google Chrome, you might want to try this.
Open a new tab and click this link (we know. A link without context. It's time to put your trust to the test).
You should see an Add to Chrome button. Feel free to click that.
Hey presto! Now instead of the standard new tab page, you get to look at one of about ten thousand stunning landscapes courtesy of Google Earth every time you open up a new tab.
You're welcome.