Use this coffee and tea warmer to keep hot beverages warm during work or leisure. Relax and enjoy the beverage, as you don't have to get up and down constantly to reheat your drink. To activate the warmer, place any beverage weighing 5.3 oz. (29.6 mL) or more, and the warmer instantly begins to work to keep your tea or coffee warm. The device is powered by USB, so this warmer is easily portable from work to home. Details: Black Holds 5.3 oz. (29.6 mL) or more Lightweight Ceramic Contents: 3.26" x 3.74" x 3.74" mug 6.42" x 4.72" x 0.91" plate 35.4 inches (10.2 cm) USB cable