The "Module" vacuum thermos not only keeps your drinks hot, but also shows how hot they are! The unique feature of the thermos is a touch temperature indicator located in the lid. To find out the temperature inside the thermos, simply touch the surface of the lid. The inner flask is made of high-quality SUS 316 stainless steel with the addition of molybdenum, making the thermos even more resistant to corrosion. The thermos is covered with a soft touch rubber coating on the outside, making it comfortable to hold in your hand. - "Food-grade" durable SUS 316 stainless steel. - Touch temperature indicator. - Removable filter. - Soft-touch coating. The battery (CR2450) in the lid is non-removable. Estimated battery life is 1000 days or 80000 presses. * compared to counterparts made of 304 steel.