ThermaCELL MR-T Realtree APG HD Cordless Portable Mosquito Repellent Appliance Repels up to 98% of mosquitoes. Also repels black flies, no-see ums and sand flies. Provides a 15 x 15 ft Bug-Free-Zone Compact, Cordless and Portable Take it anywhere! NO DEET and EPA approved. Odor free undetectable to animals.