Safe Continuous Pest Control that Works! Refillable & Non-Toxic. Hang BugPellent in a barn, carriage house, garage, patio or deck area. Pleasant vapor release repels flies and other insects. Replaces whole barn spray systems which expose people and animals to toxic chemicals. Economical refills available. Contains no pyrethrins, pyrethrums or pyrethoids. Contains only natural essential oil and organic waxes. Does not require batteries or an electrical outlet.