Skeeter Screen 4 Oz Patio Egg Mosquito Deterrent Diffuser is a deet free, safe, effective way to deter mosquitoes and other biting insects from outdoor living areas. The egg's porous nature allows the oil to migrate up the sides and diffuse into your surroundings. Once the oil has absorbed into the egg it will be effective continuously, 24/7. Includes 4 oz. of Scents of Nature oil, hanging net and measuring cup.