The Thermacell Mosquito and Midge Repeller Refills repels mosquitoes, black flies, and other biting insects by creating a 15 x 15-foot zone of protection for bug-free comfort. This Standard pack contains 3 insect repellent mats and 1 butane cartridge. Each insect repellent mat provides up to 4 hours of protection, and each butane cartridge lasts for up to 12 hours, offering extended protection from mosquito and midge bites. The mats and cartridges use Allethrin, a synthetic insect repellent that mimics the natural repellent found in chrysanthemums. These refills are compatible with all Thermacell Mosquito Portable Repellers and Lantern Mosquito Repellers.
