All you'll need is the soul of a victim and one of their eyes.
But it's fine if you want to let people think that's how it's done. Just kidding.Haunted Light Up Doorbell with Eyeball and Sound Prop | Wall Decorations Who's There? When you're a master of the dark arts, you can develop your own methods of screening callers. Product DetailsStartle your visitors with this Haunted Light Up Doorbell! Press the button at the bottom to hear a selection of spooky, pre-programmed sound effects, and make the eye open up to give you the once-over! The unique prop is designed to look like an old-fashioned doorbell, with a vivid, realistic eye in the center.