Mustard USB Cup Mug Warmer Coaster - Dark Brown Hot Cookie (NG1702) Plastic Hot Cookie USB Cup warmer with Stainless Steel heat element Measures 4.09 x 1.00 x 4.17 inches Plug and Play USB Cookie coaster which operates up to a temperature of 50c / 122 F to help slow the cooling process of your drink. Also features on/off switch. Windows PC and Mac compatible USB accessory This is not a toy. Do not eat. Gets hot during use, handle with care