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the USB Mug Warmer is Made of High-quality Hot Silicone Materia, a Good Gift Gor the Winter,. USB Mug Warmer Coaster is Powered by the USB Cable Connecting with the Computer or Adapters. It Can Keep Cup & Mug Warm for Long Time. Just Place the Teacup or Coffee Cup That Needs to be Heated on the Coaster & Then Plug Line Head in to a USB Outlet & It Will Start to Work to the Temperature You Want with the USB Port. Minimum Quantity: 200