COLOR-CHANGEABLE STRIPES: Using a temperature-sensing process, when the water is boiled, the stripes will change their color, and when the water cools, it will return to its original color again. This is a physical change, not a chemical change, safe but amazing. SUITABLE CAPACITY: The capacity of this color-changing stainless steel kettle is 2.5L. Our investigation found that this capacity is very suitable for ordinary households (3-4 people)to used for making tea, coffee, and cooking FEMALE-FRIENDLY HANDLE: The handle meet with ergonomic, and in the family, in order to be more suitable for woman's use, we designed such a handle-so that the hostess can lift the kettle, fill and pour water with less effort NOVEL WHISTLE: This cool color teapot, when the water is about to boil, it will make a relatively small sound. If you are busy with other things and have not heard it, it will make the sound maximum, allowing you to hear,when the water is completely boiled WARMTH RETENTION WELL: Due to the tea kettle lid and spout are designed appropriately and there is no gap,no loose interface ,then the boiling water will not cool down quickly, which is better in winter