There is a USB Cup warmer. Small and practical cup warmer made of safe material. With a minimalist look, this product is good accessory for a drink and in the office. The heated coaster keeps your mug warm, can enjoy coffee, tea and other hot beverages slowly. Features -Color:Assorted Color -Material:ABS + Glass -Size:13.20X11.80X2.30cm/5.19X4.64X0.90in -Note: without cup and battery. -Rated Power: 10W -Rated Voltage: 5V -Rated frequency: 10 (Hz) -Adjustable: 3 gears - The appearance is light, unique and delicate, easy to carry, and the size is convenient for storage. - Ultra-thin design, compact and portable, three gear adjustable, high and low temperature automatic switching. - Also suitable for most different mug styles and sizes, like stainless steel cup, milk box, glass cup. - It keeps your mug warm, can enjoy your coffee, tea, and other hot beverages slowly. - The surface of this heating coaster is very easy to clean. Wipe the surface with a damp cloth. Package list: 1 × usb cup warmer 1 × USB cable