1. [Keep Drinks Warm]: This mug warmer maintains your hot drink at a constant temperature of 40C to 60C, ideal for sipping without the need for reheating. Enjoy warm coffee, milk, tea, hot cocoa, and more whenever you're busy at work.2. [Safe and Durable]: This 18-Watt low power coffee mug warmer is constructed from advanced materials that are heat-resistant, fire-resistant, and splash-proof, ensuring safety and energy efficiency. Plus, cleaning is effortless.3. [Easy temperature control] : coffee cup heater blue working light, low temperature. Red work light, high temperature. Just touch the "Temperature button" to select your preferred temperature.4. [Fits Most Cups]: The electric coffee warmer has a 3.15" diameter heating area, making it suitable for most cups, whether they're made of glass, stainless steel, ceramic, and more.For better insulation, use thin-walled, flat-bottomed cups, and consider adding a lid to your cup to help maintain the temperature.5. [Please Note]: This mug warmer for desk is designed to keep your hot drink warm for sipping and cannot rapidly heat cold drinks to boiling.