DescriptionHigh-quality materials: This coffee cup warmer is made of aluminum alloy and tempered glass, it has fast thermal conductivity, so the temperature of your coffee cup can reach a constant temperature of 40 in 5 minutes ( please note that this coffee cup warmer is used to keep your cup warm, not to heat it).Plug and Play: USB powered, you can comfortably plug in any USB-enabled device, such as laptops, travel chargers or other USB devices.Energy Saving: With low power consumption, this coffee mug warmer is energy efficient and leak proof.Simple operation: With an indicator light and switch function, this coffee mug warmer is easy to control.Perfect for the office: the insulated coffee mug warmer is designed to maintain the temperature of drinks, which is suitable for coffee lovers or the office.Color:BlackFeatures:Name: Coffee Mug WarmerMaterial: Aluminum alloy and tempered glassSize: about 82 x 82 x 70mm or 3.23 x 3.23 x 2.76inUSB Power: 5V or 2APower: 7WPacking List:Coffee cup warmerx1Notes:1 . This coffee cup warmer uses USB power with convenience and safety in mind, so the power is limited, and it is only suitable for heat preservation, not for heating cold water.2. Generally, when the ambient temperature is 26 degrees, prepare a cup of tea (coffee) and put it on the coaster. Then this coffee cup warmer can keep your tea (coffee) warm, the temperature is around 40 degrees or more. This coffee cup warmer is suitable for all flat bottom cups with good thermal conductivity. This coffee cup warmer is suitable for office use.3. It is estimated that it will take about 20 minutes to heat a cup of cold water to around 40 degrees.Sold by Briday store Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.