Earth Scent Refills keep your portable mosquito repellers fueled for the long haul with no batteries or cords needed. These long-lasting, earth-scented refills work to mask human odor – ideal for hunting, outdoor photography, and other activities where you want to be undetected by animals. Always be prepared by keeping an extra cartridge and mats in your tent, backpack, garage, or hunting bag, ready when you need it.