For the backyard and beyond, Thermacell Multi Insect Repellent Refills keep your Patio Shields, Lanterns, and Portable Repellers running for the long haul, with no batteries or cords needed. Compatible with all fuel-powered Thermacell repellers (except the Backpacker). The first and only EPA-registered area repellent for black flies and no-see-ums, these refills protect from mosquitoes, black flies, and no-see-ums (gnats). Not for the common house fly.Specifications and Features: Active Ingredient: 10.86% Prallethrin Refill / Cartridge Type: Mat and Fuel Refills Hours of Protection Included: 60 Hours Weight: (15) Mosquito Repellent Mats 1.25 ounce (5) Butane Fuel Cartridge 5.0 ounces