Buy Now COSORI Coffee Mug Warmer & Mug Set $40.00 PERFECT MATCH: Stainless steel retains heat more efficiently than other mugs, making it a perfect match for the coffee warmer. PROPER TEMPERATURES: All temperature readings are accurate to within 1 degree. You can also easily switch between Fahrenheit and Celsius. BUILT TO LAST: Enjoy the reliable performance of the stainless steel coffee warmer with one-touch control, waterproof design, and PI foil heating element. Compatible with AC 100-240V, 50-60Hz outlets. SPILL RESISTANT: Equipped with a high-tech Pi film heating element, the spill-resistant design prevents damage and makes cleaning a breeze HIGH-QUALITY MUG: The 17-ounce mug made of food-grade 304 stainless steel has a heat-resistant handle and a rubber sleeve to protect your hands. FOR EVERY DRINK: Keep coffee, tea, milk, or cocoa hot with the stainless steel coffee warmer. PERFECT GIFT: The elegant and portable coffee warmer is the perfect gift for someone who loves a hot cup of coffee or tea at home or in the office.