DetailsRefills fit all ThermaCELL mosquito repellent models. Each cartridge lasts up to 12 hours, and each mat lasts up to 4 hours.
To continue to repel mosquitoes repellent mats should be replaced after 4 hours of use. Butane cartridges last up to 12 hours each.
Refills can be stored for long periods of time, cartridges and mats don't need to be used all at one time. For example, one could use the cartridge and mat for an hour a day. Simply turn the unit off and restart when ready. If time between use will be more than a 1 week, store the mat in a dry, dark place.
The repellent, allethrin, is a synthetic analog (chemical copy) of a naturally occurring insecticide, pyrethrin, found in the pyrethrum flower, a member of the chrysanthemum family.
**Package contains 4 Butane Cartridges and 12 Repellent Mats.
