The "Module X" vacuum flask not only keeps your drinks hot, but also shows how hot they are! The unique feature of the flask is a temperature sensor indicator located in the lid. To find out the temperature inside the flask, simply touch the surface of the lid. The CR2032 battery can be replaced after its lifespan (1-2 years) - to do this, unscrew the top part of the lid counterclockwise and carefully replace the power source. The inner flask is made of high-quality SUS 316 stainless steel with the addition of molybdenum, which makes the flask even more resistant to corrosion. The outside of the flask is covered with a soft-touch rubber coating, making it comfortable to hold in your hand. - "Food-grade" durable SUS 316 stainless steel - Double-walled with vacuum copper insulation - Temperature sensor indicator - Removable sieve - Soft-touch coating - Replaceable battery * compared to counterparts made of 304 stainless steel.