Repels mosquitoes. Each coil burns for 5 - 7 hours - outdoors. For Outdoor Use: Outdoors place one coil every 10 feet; Use on patios and porches; For best results use in confined are. Dependable insect and rodent control since 1953. PIC Mosquito Coils help repel mosquitoes in confined area outdoors. It is useful in places where there is little or no breeze such as patios, porches, picnic area and campsites. Made in Malaysia.