For the backyard and beyond, Thermacell Refills keep your Patio Shields, Lanterns, Torches, and other fuel-powered Thermacell Repellers fueled for the long haul, no batteries or cords needed. Always be prepared by keeping extra cartridges and mats in your tent, backpack, garage, or tackle box so they are ready when you need them. This Thermacell Mosquito Repellent Refill pack comes with 12 hours of mosquito repellent and fuel.