The Incognito room refresher will keep insects out of a room for up to 3 weeks after opening, up to 6 weeks if the lid is replaced when not in use. With a fresh pine and citrus aroma this is a perfect unobtrusive way to keep your house free of insects during the summer. Also great for tents and caravans. Combine with incognito incense sticks for indoor and outdoor protection. Fresh pine and citrus aroma Use indoors to keep insects out for up to 3 weeks 100% natural Works on all insects, powerful enough to use anywhere in the world.