The Rescue! Indoor TrapStik Fly Trap uses VisiTrap optical technology to lure flies to their death. Adhesive-based sticky trap has the VisiTrap pattern, which combines a series of colors in a multi-dimensional pattern that is appealing to insects. Once lured to the patterned tape, flies remain trapped in its sticky adhesive. Hang indoors or in sheltered locations. For best results, hang where you see the fly problem (i.e. windows, garage, screened porch). Avoid using where birds or pets may come in contact with the adhesive. Odor-free and non-toxic.