Protect your backyard, campsite, or outdoor space with the Thermacell Perimeter Mosquito Repellent System—the ultimate defense against mosquitoes. This multi-unit system creates a powerful perimeter of protection, stopping mosquitoes before they can bite you or your guests. With dual mounting options, the Perimeter system is versatile enough for any outdoor setting, including patios, decks, gardens, campsites, and hunting trips. Each unit provides a 21m² mosquito-free zone, and when combined, the two-pack extends coverage to 42m². For even larger areas, simply add more units to expand your defense.