The Thermacell Max Life refills offer up to 12 uninterrupted hours of mosquito repellency. The Thermacell Mosquito Repellet system effectively repels mosquitoes, black flies, and other biting insects by creating a 15 x 15-foot zone of protection for bug-free comfort. Ideal for use while you are camping, hunting, fishing, gardening, and around the backyard, Thermacell products have been evaluated by the EPA for safety and effectiveness. Product Features Each Max Life mat provides up to 12 hours of repellency Refills work with all Thermacell repeller devices (Repellers, Lanterns, and Torches) Up to 48 hours of mosquito protection in each box Contains (4) butane cartridge and (4) repellent mats for (48) hours of biting protection 15 ft. x 15 ft. zone of protection against bugs or 225 sq. ft. Effectively repels mosquitos, black flies and other flying, biting insects Mats are odorless