Customized Temperature Control: With this smart mug heater, you can enjoy your beverage at your preferred temperature. There are three temperature settings to choose from 55, 65 and 75 which can be tailored to your taste. Keep your tea or coffee at the perfect temperature, providing constant temperature all year round. Automatic Safety Feature: The electric coffee cup heater has an intelligent automatic shut-off function after 8 hours, preventing safety hazards when you forget to turn it off. For added safety, please avoid touching the heated surface after turning it on or off for a period of time. Portable and USB Powered: This USB-powered heated coaster is compact and convenient, with a size of 11.2x1.5 cm, making it easy to carry. The perfect size fits all kinds of cups (glass, stainless steel, ceramic, etc.), does not take up too much space, and is perfect for putting in a bag or backpack. Great Gift Choice: Delight your loved ones with the gift of hot drinks anytime, anywhere. This mug warmer is perfect for birthdays, Christmas, Thanksgiving, or even as an office gift - a thoughtful gesture that shares your care and warmth.