The Bandito utilizes EPA approved insect repellents such as lemongrass, citronella, and peppermint. These ingredients have been widely accepted as the most effective natural substitutes for DEET. The sonic sound is designed to imitate mosquito predators which keeps mosquitoes at bay. If you still have concern why don't you try out the Bandito? If it doesn't work to your satisfaction you can always return it within 14 days upon delivery :)