This Thermacell Mosquito Repellent Refills (16-Pack) contain 4 butane cartridges and 12 repellent mats. Each cartridge works for up to 12-hours to provide a total of 48-hours of repelling power. They will repel mosquitoes， black flies and no-see-ums so you can enjoy your outdoor activities. The Value Pack Refill comes with 4 butane cartridges and 12 mats for up to 48 hours of protection. Refills are also available in a Single Pack Refill， which comes with 1 butane cartridge and 3 repellent mats， providing up to 12 hours of protection. This product is registered by the EPA.

Product Features:

• Each butane cartridge lasts for 12 hrs. (48 hrs. total)
• Contains 4 Butane Cartridge Refills
• Contains 12 Repellent Mat Refills
• Works for all ThermaCELL mosquito repellent products
• MFG Brand Name : ThermaCELL
• MFG Model # : R-4
• MFG Part # : R-4