The USB Whirl Wind Warmer Cup is a lifestyle gadget. It is a drink warmer that can keep the drink in around 40°C. it also be a Whirl Wind cup; built-in lid and rechargeable battery. Just press the button, the lid will swing and stir your coffee or tea. No stirrer any more! Just press a button to stir the liquid Work as a mixer, etc Keep coffee/tea/drink warm at around 40°C LED battery capacity indicator Switch button for Heat, Stir, Heat + Stir or Power off function Rechargeable battery which is environmental-friendly Powered by USB or rechargeable battery Charged by USB or AC adapter(AC adapter doesn't included.) Dimension: 62 x 62 x149mm (approx.) Weight: 202g