Description: Just plug the adapter into the outlet, then put your mug on and the cup warmer will work auto, which can be fit most cups, such glass cup, stainless steel cup and ceramic cup. You can sip your coffee at any time without waiting when you put the cup on this product, since it can maintain optimal temperature of the drink with its design of even heating and constant temperature features. Made of metal material, this product is wear-resistant and long-lasting. The length of this product is 12.4cm, the width is 12.4cm, and the thickness is 2.6cm. It is suitable for being used in home, office, dormitory and so on. Item Name: Mug Warmer Material: Metal Rated Power: 20W Power Supply: USB Charging Temperature Level: 55 Degrees, 65 Degrees, 75 Degrees Working Time: Automatic Shutdown After Working 8 Hours Features: Small Size, Touch Control, Constant Temperature Size Details: 12.4cm x 12.4cm x 2.6cm/4.88" x 4.88" x 1.02" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Mug Warmer 1 x User Manual(in Chinese)