【High-quality material】 This glass warmer is made of high-quality walnut wood and metal materials, which heats evenly, is safe and durable to use, and has a natural walnut wood texture and a smooth touch. 5V USB port power supply: Powered by any devices with a 5V USB port output, such as your computer, desktop, laptop, tablet, power bank, etc., easily and conveniently. 【Warming at 80°C】 Keep coffee, tea or other hot drinks warm at 80°C, no need to worry about high temperature and high oxidation, safe to use. 【Mini portable】 Ideal for use at home and in the office, keeping you warm in cold weather. Lightweight, compact and easy to carry, suitable for most stainless steel rollers, baby bottles, ceramic cups, glasses, etc.