Kobe range hoods' CH22 series 30-inch under cabinet range hood is a hands-free fully auto range hood! It is compatible with all brands of gas ranges. The hood is built with a flame and temperature sensor which will automatically turn the fan on and adjust the speed level while cooking and turn it off after cooking. Other features include eco-mode technology, delay shutoff, and 3-level lighting. Our exclusive eco mode uses very little power to turn the fan on in quiet mode for 10 minutes every hour to refresh the air.