Pour the essential oil, included, into the diffuser and then set it on a table or place it in the netting to hang it anywhere you want to repel these annoying pests. The porous ceramic diffuser allows the fragrance to migrate up the sides and diffuse into the air. Protects a 200 square foot area. Add more oil every two weeks -- if you smell the pleasant-smelling oils, it's working! Great for patios, barns, garages, workshops, garden sheds, greenhouses, tents, porches, etc. The diffuser is glazed on the bottom to protect surfaces. The kit includes the diffuser, 4 fluid ounces of oil (enough for up to four months of continuous protection), a natural-fiber netting and measuring cup.