Used with or without the optional All-Purpose Swivel Light (LED clip light) and Holster with Clip, this ThermaCELL insect repellent appliance with Earth Scent is functional gear for hunters. It is the only butane-operated mosquito repellent and cover-scent system. Emits earth scent - The smell of musky dirt and decaying leaves masks human odors up to 4 hours per mat. Uses the same highly effective mosquito repellent as original ThermaCELL mats. Repels up to 98% of mosquitoes, black flies, and no-see-ums. Creates an effective insect-protection zone of 15 x 15 feet. Safe to use - No DEET and no open flames. No lotions, sprays or oils on the skin. Compact & portable: weighs 0.7 lbs. Mosquito repellent operates on a single butane cartridge (included). The butane warms the insect repellent mat (included), which releases the repellent into the air. Uses allethrin, a synthetic copy of a natural repellent found in pyrethrum flowers. Contains: 1 reusable Appliance, 1 butane cartridge (lasts up to 12 hours), 3 insect repellent mats with Earth Scent (lasts up to 4 hours each).