"All you have to do is remember to do what sparrows do and go to your house whenever you're in the area. You can't do that? Are you a birdbrain or what? Sorry. From a website: Let the little sparrow be your best friend. He will be everywhere with you. He can whistle to make noise and ask for help in an emergency. And as soon you come home he puts your keys in a safe place. The little birdhouse is self-adhesive on the back. " $18.