This is a USB heating coaster, made of material, and practical. The creative and chic design makes it more likable. Very convenient for home use and office use. Suitable for keeping warm for drinks, coffee, tea water, milk and etc. Features - Color: Assorted Color. - Material: Plastic. - Size: 10.00X10.00X2.50cm/3.93X3.93X0.98in. - Design: indicator light - Mode: Maintain constant temperature and heat, and the surface heat temperature is between 75-80 degrees - Usage: Support computer USB socket and output power supply above 5V1.0A - Water temperature: The water level in the container is maintained at 40-45 degrees. The ambient temperature and container style will affect the water temperature - Note: It is not recommended to use uneven bottoms, vacuum flasks, blow-molded bottles and cups with thick bottoms, as they will affect the heat preservation effect - Adopts quality material, it will serve you . - Light and elegant appearance, unique and delicate, which is convenient to store. - Heated plate keeps your mug warm, can and enjoy your cup of coffee, tea, hot cocoa and other hot beverages. - The power will be turned off automatically, and it’s to forget it occasionally. You can use it with confidence. - Great for use at the office, home, dorm and travel! It will serve you well. Package list: 2 x Coaster