1、[Smart Temperature Control] This smart cup warmer keeps your coffee, tea, and beverages at a constant temperature of 131℉ (55℃) throughout the day, ensuring you can enjoy hot drinks anytime. 2、[USB Powered Convenience] Powered by USB, this coffee warmer can be easily connected to your computer, power bank, or other adapters, providing a convenient using solution. 3、[Waterproof Design] With its waterproof design, this cup warmer eliminates any safety concerns associated with spills or accidental splashes. 4、[Energy Saving] With ultra low power consumption, this mug warmer helps save energy while still keeping your drink warm for extended periods. 5、[Portable Size] Lightweight and compact, this cup warmer is easy to store and carry, suitable for use at home, in the office, or while traveling.