This Mug/Cup Warmer is the perfect solution for keeping your beverage warm and working also as a plug in charge center for you phone or other electronics with its 4 USB plug in areas. Enjoy a hot cup of coffee, tea, or any kind of beverage at any time, whether its at home or work with this cup warmer. Its extremely easy to use, just plug it in and turn it on. This single-cup coffee warmer makes a great gift for any coffee/tea lover. It can also be used to heat soup or cocoa as well. This electric warmer has a smooth shiny silver finish and is made out of durable plastic on the outside ring and has non-skid feet at the bottom to help support your mug and prevent spills. Contains an AC adapter input (DV5.0V/1-2A), plug in cord not included. Measures approximately 3 3/4" in diameter and 3/4" in height. Plug-in cord measures approximately 36 1/2" in length. Product will fit mugs/cups with a base diameter of 2 3/4" and under. Has 16 watts of power. When light is green only, this means it is on. When light is both green and red, this means that it is on and is hot.