ITEM NAME:USB Insulation Coaster Heater Heat Electric Coffee Cup Mug Mat Pad Home Office3C Features: This product is UBS insulation products. Standard USB1.1 interface,.Use for coffee, tea, hot cocoa & more. 1x Insulation Coaster Heater. Keep the coffee / milk / cup temperature: 40-50 degrees. This product is UBS insulation products. This product temperature is maintained at 45Â ° around, keep your drinks warm.