Thank you for viewing. Although the instruction manual is missing, operation is easy and there are no problems with how to use it. Please refer to the following: The cup warmer can boil water: The temperature of the cup warmer can be adjusted in 5 levels, up to 100°C, with intelligent touch and a microgravity sensor switch, making it safe to use, energy-saving, and worry-free. Suitable for any office or home. Automatic shut-off: Thanks to the cup warmer's automatic shut-off design, it automatically turns off after 8 hours, so you don't have to worry about forgetting to turn it off, and it's safe to use. Touch button 5 temperature settings: Temperature control at various stages, different temperatures are suitable for heating different beverages. 40-50°C, 50-65°C, 65-75°C, 75-90°C, 90-100°C, 5 temperature indicator lights, touch the switch to switch the temperature, touch the switch for 3 seconds and then wait. Waterproof heating plate: The coffee cup warmer adopts a heat-resistant glass ceramic panel, so you only need to wipe it with a cloth, so you don't have to worry about water accidentally getting on the heating plate. Warm winter gift: The coffee cup warmer is suitable for tableware such as metal, ceramic, enamel, tile, high-temperature plastic, and glassware. This is a great birthday/holiday/Christmas gift for coffee drinkers and tea perfectionists. It's also a great gift for people who are sensitive to the cold.