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The Sealy Coffee Mug+Mug/Cup Warmer 2Pc Set is a reliable and durable option for keeping your coffee hot. This set includes a white coffee mug, a mug warmer with a gravity switch for safe use, and a USB power source for convenient operation. The mug warmer has a constant temperature control at 45 degrees Celsius and is USB powered with a 10W voltage. The sleek design and efficient power source make this set a practical addition to any kitchen or workspace.