Mosquitos are no small problem - they can ruin a good time with painful bites, bothersome buzzing, and days of itching afterwards. Until now, sprays, lotions, torches, DEET 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 fighting mosquitoes. Enter Thermacell. For the backyard and beyond, Thermacell Perimeter SystemandThermacell Patio Shield Torch Mosquito Repellerareeasy to install and providelarge areamosquito protection. Scent-free, mess-free, DEET-free mosquito defense, the Perimeter Systemand Patio Shield Torch areideal to surround your backyard, patio, or pool with discreet mosquito defense. Simply plan out the Perimeter around your entertaining area, insert a fresh cartridge and mat, and enjoy hours of distraction-free fun.