General description The in 1 Mug Warmer is a versatile USB heating coaster designed to keep your beverages warm, including milk, tea, coffee, and hot chocolate. Its compact and portable design makes it ideal for use in various settings such as offices, homes, hotels, and while traveling. Technical specifications Material: Environmentally friendly plastics and heating elements Heating method: USB connection Compatibility: Suitable for most cups, including glass beakers, stainless steel cups, and ceramic cups Usage Plug-and-play USB connection for easy operation Press the power switch to activate heating Recommended to use flat glass or ceramic cups for optimal heating Covering the lid helps retain heat Other information This desktop coffee heater makes a thoughtful gift for family and friends on occasions like Christmas, Valentine's Day, Thanksgiving, and birthdays.