PERFECT MATCH: The stainless steel retains heat more effectively than other mugs, making it the perfect pairing to the coffee warmer CUSTOM TEMPERATURES: All temperature readings are accurate within 1 degree. You can also easily switch between Fahrenheit and Celsius BUILT TO LAST: Enjoy the stainless steel coffee warmer’s reliable performance with one-touch controls, waterproof design, and a PI film heating element. Compatible with AC 100–240V, 50–60Hz outlets SPILL RESISTANT: Equipped with a high-tech Pi film heating element, The spill-proof design avoids damage and makes cleaning a breeze HIGH-QUALITY MUG: Built from 304 Food-Grade Stainless Steel, the 17-ounce mug features a heat-resistant handle and rubber sleeve to protect your hands