It's a kettle and a pot in one. That's probs why it's called ONE but we're calling it the Pettle. You pour the water in, plop it right on the stove and heat it up. As the water starts to get hot, the porcelain white reveals a pretty blue design. That's how you know it's ready! Sit the ONE on the magnetic holder and it's ready to go. This one's a must have for your next tea party for sure!