Material: Stainless Steel, Polypropylene and Silicone Food Safe: Yes Dishwasher Safe: No Reusable: Yes Volume: 450ml BPA Free: Yes Digital Temperature Display: Touch the top with your finger to give a digital readout of the temperature inside. The battery inside the lid is a fixed unit that is not replaceable, however it will last for approximately 18000 uses. Product Information: Insulated design suitable for hot and cold drinks. Thermal design keeps liquids cold for up to 24 hours or warm for up to 6 hours. There is a removable tea strainer that sits in the top for loose tea leaves. Also comes with a handy strap.