1. Power supply mode: usb power supply (please use 5V=2A charging port to power the product) 2. Temperature range: 3 files, 55-65-75, the actual heating temperature is 50-60-70 3. Timing function: automatic shutdown after continuous use for 8H 4. Applicable: flat-bottomed cups with a diameter of less than 7.5cm5. Smart roller coaster. Keep your life warm, take care of yourself, and start every morning with a hot drink 6. Overcome technology, 5V voltage can reach the same temperature as 220V voltage 7. The concave plate design can prevent the cup from being accidentally dropped and overturned 8. Uniform heating, faster heating, small and exquisite, energy saving and low consumption, the temperature can be seen 9. Quiet more comfortable, does not affect work and sleep 10. Best Gifts: Delicate and compact design, keep your drinks warm all the time. On Valentine's Day, Thanksgiving, Christmas or other special occasions, it will be the best gift to express your care to your family, lover or friends. 11. Tips: According to the external environment and the thermal conductivity of the cup, the temperature inside the cup will be different. 12. Size: 136*127*133mm Package includes: 1 x Coffee Warmer Products from LUOLV's store