EFFECTIVE MOSQUITO REPELLENT FORMULA: Thermacell Mosquito Repellent with Max Life creates a 15-foot zone of protection against mosquitoes. This 48-hour refill pack is compatible with all fuel-powered Thermacell repellers (except the Backpacker). HEAT-ACTIVATED TECHNOLOGY: No cords or batteries. Powered by a safe, compact fuel cartridge. Emits scent-free repellent that drives away mosquitoes. Unscented repellent mats last up to 12 hours each – 3X longer than original Thermacell mats. EFFECTIVELY REPEL WITHOUT SPRAY OR SCENT: Repel mosquitoes without DEET sprays or lotions on your skin. No smoke, flames, or harsh odors like citronella. Enjoy max protection in 15 minutes. No mess and easy to refill. PLANT-INSPIRED REPELLENT FORMULA: Our synthetic allethrin formula is inspired by repellent extracts found in plants. Independently tested and EPA reviewed for safety & effectiveness. People and pet friendly. THERMACELL GUARANTEE: Backed by the Thermacell Satisfaction Guarantee. See packaging for details. Includes four 12-hour fuel cartridges, and four 12-hour repellent mats.