Multi-insect repellent refill. Thermacell's award-winning technology keeps mosquitoes away by creating a 15-foot protection zone around you. The proprietary formula precisely targets mosquito sensors, driving them away. With consistent protection that doesn't weaken over time, Thermacell helps you live your best out side life without the use of bug sprays or lotions on your skin. The multi-insect refills also repel black flies and no-see-ums. Not for the common house fly. This refill pack is compatible with all Thermacell fuel- powered repellers (except the Backpacker). Comes with 96 hours of multi-insectrepellent and fuel.