PIC Mosquito Repelling Coils help to repel mosquitoes in confined areas outdoors. It's best used in places where there is little or no breeze such as patios and porches. Do not use indoors.• For Outdoor Use Only• Each Coil Burns 5-7 Hours• Place One Coil Every 10'• Use on Patios and Porches• Repels Mosquitoes That May Transmit Zika Virus• Includes One Burner and 4 Mosquito Coils Each coil burns 5-7 hours Includes one burner & 4 mosquito coils For outdoor use only | PIC Mosquito Repelling Coils with Coil Burner, 4-Pack