HadinEEon Electric kettle. Ideal for every tea or Coffee lover food grade material its made with glass & stainless steel. All the water contact surfaces are constructed of FDA approved & food grade material and heat-resistant. attractive and functional indicator the indicator are a cool and fun feature and are a good and clear indicator of when the water has finished boiling. If someone else approaches it, They wouldn't touch it and burn their hand. stylish and sleek glass design compare with the Old, Dated, non-attractive, basic white boiling kettle, The glass kettle is a large improvement in the aesthetics Department! It will be the perfect addition to your kitchen. it is very simple to use. Fill the kettle with water between the lines, plug in the base & set the kettle on top. Press down the clear switch, watch & wait. how to clean mineral deposits in tea kettles any tea kettle that has seen good use is bound to develop some mineral buildup, especially in the hard water area. Calcium and lime buildup can be dissolved with mild acids such as white vinegar and lemon juice. to remove it, please follow the instructions: 1. Fill the kettle with an equal part solution of water and household vinegar and let this soak for an hour. 2. Once the hour is up, just boil the kettle. 3. Empty the kettle and rinse it thoroughly.