This summer, keep mosquitoes at bay with our all-natural, DEET-free, gentle insect repellent. Simply pour 4 ounces of Z-Oil into a Z-Fuser and place outdoors to be bug-free! Using thyme oil as a signature ingredient, the slow-release formula creates a 6-foot barrier zone that protects your family from bites. The set includes a terracotta diffuser and 4 ounces of Z-Oil. Refill Z-Fuser every four to six weeks, depending on weather conditions.