For the backyard and beyond, Thermacell fuel cartridges keep your Patio Shields, Lanterns, Torches, and other fuel-powered Thermacell Repellers (except the Backpacker) fueled for the long haul, with no batteries or cords needed. Always be prepared by keeping extra cartridges in your tent, backpack, garage, or tackle box to be ready when needed. This Thermacell Mosquito Repellent Refill pack comes with 48 hours of fuel cartridges.EFFECTIVE MOSQUITO REPELLENT FORMULA: Thermacell Mosquito Repellent creates a 15-ft (4,5-m) zone of protection against mosquitoes. 48-hr fuel refill pack containing four fuel cartridges compatible with all fuel-powered Thermacell repellers (except the Backpacker).LONG-LASTING DEFENSE: 48 hours of fuel included. No mess and easy to refill.HEAT-ACTIVATED TECHNOLOGY: Thermacell fuel-powered devices don’t require cords or batteries. Powered by a safe, compact fuel cartridge. Emits scent-free repellent that drives away mosquitoes.EFFECTIVELY REPEL WITHOUT SPRAY OR SCENT: Repel mosquitoes without chemical sprays, lotions, or DEET on your skin. No smoke, flames, or scents. Enjoy maximum protection in 15 minutes.PEOPLE AND PET-FRIENDLY: Powerful outdoor area repellent for people and pets. Independently evaluated for safety and effectiveness. Always use as directed.THERMACELL GUARANTEE: Backed by the Thermacell Satisfaction Guarantee. See packaging for details.