For the great outdoors and beyond, Thermacell Earth Scent mosquito repellent refills keep your portable mosquito repellers fuelled for the long haul with no batteries or cords needed. These long-lasting, earth-scented refills work to mask human odour, ideal for hunting, outdoor photography, and other activities where you want to be undetected by animals. Always be prepared by keeping extra cartridges and mats in your tent, backpack, garage, or hunting bag so they are ready when you need them.