For the backyard and beyond, Thermacell Patio Shield Mosquito Repeller is easy to use and provides hours of scent-free, no mess defense against mosquitoes. With no batteries or cords needed, the Patio Shield is convenient, portable protection against mosquito bites, ideal for entertaining, gardening, poolside, and more. The Patio Shield features a 15-foot mosquito repellent zone powered by a safe and compact 12-hour fuel cartridge that emits scent-free mosquito repellent to drive away mosquitoes. Mosquitoes are no small problem - they can ruin a good time with painful bites, bothersome buzzing, and days of itching afterward. Until now, DEET bug sprays, lotions, torches, and citronella have been the only options for fighting mosquitoes. We started Thermacell because we wanted a better way to fight mosquitoes. From humble beginnings, our team of entomologists, researchers, and outdoor enthusiasts has over 100 years of combined experience repelling mosquitoes, and for 20 years our mission at Thermacell has been to change the way the world fights mosquitoes. Headquartered outside of Boston, with distribution centers in Georgia, we're leading the way with better solutions to biting insects. With global distribution in 30+ countries and tens of millions of insect repellents sold, more and more people around the world count on Thermacell to make outdoor activities even better.