ThermaCELL® Mosquito Repellent Refills come in a variety of quantities. One refill includes 3 mats and 1 cartridge, for a total of 12 hours of repellency. To continue to repel mosquitoes repellent mats should be replaced after 4 hours of use. Butane cartridges last up to 12 hours each. Refills fit all ThermaCELL mosquito repellent models. Mats Each mat lasts up to 4 hours Mats can be stored for long periods of time A mat can be used for short periods of time; turn unit off and restart when ready If time between uses will be more than one week, store the mat in a dry, dark place Insect repellent in the mat is allethrin, a synthetic copy of pyrethin The natural insect repellent pyrethin comes from the pyrethin flower, a member of the chrysanthemum family Fits all ThermaCELL appliances and lanterns Butane Cartridges Each butane cartridge lasts up to 12 hours Butane cartridges can be stored for long periods of time A butane cartridge can be used for short periods of time; turn unit off and restart when ready Fits all ThermaCELL models
