Includes 1 butane cartridge and 3 insect repellent mats
Each cartridge lasts up to 12 hours and each mat lasts up to 4 hours
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)
If time between use will be more than 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