That is a sulfur vaporizer AKA sulfer burner. It is the best way to get rid of powdery mildew and also gets rid of mites, aphids, and other pests. the best part of it is that it is 100% organic and natural and wont leave your room smelling like bug bomb. it costed me about $150 total for everything but can last for ever. i reccomend it to any growers who have a powdery mildew problem or a pest problem.