Thermacell Mega Pack Refill - R-10 Includes: 30 Mats, 10 Butane Cartridges- Each cartridge will provide 12 Hours of Protection Provides 120 Hours of Repellancy. Re-spray the Repellant Mat as needed Fits all ThermaCELL models (appliances and lanterns) Mats and cartridges can be stored for long periods of time Units can be used for short periods of time ; turn unit off and restart when ready