Description: 【Versatile USB Constant Temperature Heating Pad】: This Thermostat Heat Preservation Plate is perfect for warming up food bags, baby bottles, lunch boxes, and more. It works best when used with an insulation bag to keep your meals warm for longer periods. 【High Performance Carbon Fiber Heating Sheet】: The heating sheet is made of carbon fiber, a superior material known for its excellent heat conversion properties. It offers high efficiency and energy saving benefits while being easy to use. 【Adjustable Heat Settings】: The heat preservation plate features a temperature of 45-50 degree, for lunch bags, milk bottles lunch boxes, etc, keeping the bento warm for a long time. 【Ideal for Outdoor Use】: Whether you're going on a picnic or a school trip, this heating pad is your perfect companion to keep your food warm outdoors. 【Quality Material & Specifications】: Made from carbon fiber and flannel for durability and efficiency, this heating pad is a must have for every household. Measures 10cmx20cm/3.94inchx7.87inch in size, making it compact yet effective. Specification: Material: Carbon Fiber Flannel Size Chart: 10cmx20cm/3.94inchx7.87inch Package Includes: 1 USB Thermostat Heating Pad Note: Please allow slightly errors due to manual measurement and different monitors.