This travel auto mug features thermal insulation and a 12 Volt power plug which plugs into a 12V power socket. A very clear analog display shows temperature readings and a light illuminates to let you know when your drink is ready. Features an automatic shutoff and a non skid rubber base. What more could you want? Control temperature and keep beverages hot or cold. Plugs into 12V socket. Measures: 6.5' x 4'.