This is a larger pack of refills for the Thermacell Mosquito Repellant. It contains 4 Butane cartridges and 12 insect repeller mats. The cartridge will fit into all Thermacell models.
Each cartridge lasts for up to 12 hours and each mat for 4 hours. The repellent used, allethrin, is a chemical copy of a naturally occurring insecticide pyrethrin, found in the pyrethrum flower, a member of the chrysanthemum family. There is no problem with storing these refills for a long period of time.
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