Shoes Boots Socks Warmer Dryer With Fresh Scent & Ultraviolet Light Sterilization Deodorant Voltage:100-220V,thay are working when the light is brighten It is working in seconds,usually it will be dryer in 1 hours when they are inserted in to the shoes.More time is needed if the shoes is moist badly. They have constant temperature they can be used continuously Sloeplate tempreature is 60-80degree. Make sure the plug is out of the socket after using.