Wonderful silicone heater pad to turn your kettle chamber into a home vacuum oven. Integrated with digital controller of large capacity(30A,110V), ready to be used with NO MORE tedious wiring before precise temperature is possible. Controller comes well insulated in silicone case, and capable of providing Dispaly in Fahrenheit(Celsius by default) as well as timer function after configuration. 3M adhesive backing offers excellent and easy mounting onto kettle bottom. Versatile and may be used in many other applications. We have the same sized heater pad rated at 500W if you are looking for a liquid mixing or holding tank heating pad. Keenovo carries a full range of standard and custom designed silicone heaters, contact us if you need a special heater made for your applications. Important Notes: 1)-------Please read the Controller Configuration Manual, especially the "Advanced Setting" part, carefully BEFORE making any changes on the controller. 2)-------The controller unit is 100% brand new. But due to manufacturing reasons, stains, dusts or scratches may be present on the silicone case. The case may also fit loosely. Please consider this before the purchase.