The Thermacell LIV is a built-in smart yard system for those looking for an intelligent, easy way to protect large outdoor spaces from mosquitoes. You can even control it from an app on your phone. Once the Wi-Fi-controlled system is installed, you are protected year after year—no need for sticky bug sprays, tiki torches, or citronella candles. The 5.5% metofluthrin formula is a scent-free synthetic copy of a natural repellent found in chrysanthemums that has been registered with the EPA for people, pet, and planet friendliness.