This product contains 4 coils for the repelling of mosquitoes. Mosquito Coils help repel mosquitoes in confined areas outdoors. It is useful in places where there is little or no breeze such as patios and porches. Do not use indoors and see packaging for additional instructions for proper use. Coils repel mosquitoes that may transmit zika virus and are effective when positioned every 10 feet. Each coil burns for 5-7 hours and is best used outside on patios and porches. For outdoor use only. Use the enclosed metal holder for positioning the coil above the surface of your patio table or wherever you place the coil for repelling mosquitoes. Note the direction of any breeze or wind when placing the coil around outdoor activity. PIC Mosquito Repelling Coils have been a dependable insect control product since 1953 when they were first sold to drive-in theaters. They effectively repel mosquitoes and biting insects.