Cup Warmer, USB Charging, Portable, Desktop, For Tea Coffee, Green, Cup Warmer USB charging, low voltage of 5V, safe and economical; Heating program and timer, convenient and practical; Start button for the 5 heat levels: 35°C, 45°C, 55°C, 65°C 75°C; Retro design, simple operation; Timer, 3 heating levels for 2 hours, 5 hours and 8 hours; intelligent heating system, constant heat; Small and portable, easy to place and store, easy to carry. This device is strictly for keeping drinks warm and not for boiling at high temperatures. Use mugs, cups, glasses with a perfectly flat surface, without a double bottom.