Thermacell Single Refill

- Refill includes 3 mats and 1 butane cartridge for 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 - Mats and butane cartridges can be used for short periods of time; turn unit off and restart when ready - Mats and butane cartridges can be stored for long periods of time. If time between uses will be more than one week, store the mat in a dry, dark place - Refills fit all Thermacell mosquito repellent appliances and lanterns