BAZHOU Material: iron shell + aluminum plate. The heating part is made of stainless steel, which is easy to wipe clean. USB powered by USB cable, no battery required, easy to carry and carry around. Perfect for warming up coffee, tea, hot cocoa and any other beverage that requires heating in the home, office or outdoors. It always reserves a hot drink for you. Do not touch the electric heating panel when the USB heater is working to prevent burns. The bottom of the cup should be flat to ensure a good connection between the cup and the metal heating plate. Quantity: (1-pack) USB thermal coaster, other products not included Size: 100*75*15mm (for reference only) Color: light wood grain Note, because there may be color and size difference between the light effect photo and the actual product, please allow 1-2 cm error About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 5561 hours, wish you a happy shopping Thanks for your cooperation and well make you feel satisfied.