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Features: fresh and superb This Clever Device will keep your drink heat and also includes four additional USB ports. To use easily plug the Device right into a spare USB port in your computer. Ergonomic Design Highly Portable Device. for Windows 98SE,ME,2000,XP,Vista (Not 64 Bit Versions), for Mac OS eight Specifications: Plug for Play Installation. Individual port over current for protection. Powered by USB port. four Port High Speed USB Hub. Red/Green LED Indication. Power 2 5V for DC. Color: As photos display Package includes: (Without retail package) 1 x USB Tea Coffee Cup Mug Warmer