Perfect for stainless steel cups ,feeding bottles, ceramic cups, glass cups. Maintains temperature at 45 degrees with a max temperature of up to 60 degrees. Cartoon pattern coasters, stylish and beautiful Powered by any devices with USB port, such as your computer, desktop, laptop, tablet, mobile power etc. Easy and convenient. Great for use at home and office, keeping your brew warm on cold days. Made of durable, safe, anti-corrosion and wear resistant material Material: Silicon and Electronic component Diameter: 9cm/3.54'' Cable length: 1m/39.37''(Approx.) Package Includes: 1x Heating Coasters