For the backyard and beyond, Thermacell Refills keep your Patio Shields, Lanterns, Torches, and other fuel-powered Thermacell Repellers fueled for the long haul, with no batteries or cords needed. Always be prepared by keeping extra cartridges and mats in your tent, backpack, garage, or tackle box ready when you need them. It comes with 120 hours of mosquito repellent and fuel.