Formulated with eucalyptus oil, citronella oil and cherry blossom essential oil, this essential oil contains PMD, which is a natural mosquito repelling ingredient endorsed by the U.S. Centers for Disease Control and Prevention (CDC) and the U.S. Environmental Protection Agency (EPA). ?Ding Ding Pro-Made? Complete Mosquito Repellent Aroma Stone (Cherry Blossom)? includes an aroma stone carved into the shapes of cherry blossom and Mountain Fuji, along with mosquito repellent essential oil. With just a few drops, it can repel mosquitoes, midges, gnats, ticks and flies, helping to protect you from the threat of dengue fever and Japanese encephalitis, while releasing cherry blossom aroma. Free of DEET and camphor, it is safe, reliable and causes no harm to humans, animals and the environment. Applicable for indoor (including air-conditioned rooms) and outdoor areas, e.g. household, car, office, etc.Functions:?????Combined features of natural plant mosquito repellent, air