Capacity: 450ml. Touch your finger to the top lid to get a digital readout of the temperature inside. The battery inside the lid is a fixed unit which is not replaceable and will last approximately 300.000 uses. Suitable for hot and cold drinks. Keeps liquids cold for up to 24 hours or hot for up to 6 hours. There is a removable tea strainer that sits on top for loose tea leaves. It also comes with a handy strap.