Thermacell Multi-Insect Repellent Perimeter System 2-Pack

Got this Thermacell Multi-Insect Repellent Perimeter System. It's the 2-pack set that creates a zone of protection against mosquitoes, black flies, and no-see-ums without any messy sprays or scents. Box says it comes with the two repellers, mats, and fuel cartridges. Never used it, just sitting around and figured someone else could use it for their patio or backyard setup this summer. EPA Reg. No. 71910-6