3 products in one. It converts in seconds to a bird feeder, squirrel feeder or nesting box. It¿s a Innovative design by turning the windowpane, you have a squirrel feeder or a bird feeder. Remove window to create a nesting box. Instructions for use: to use as a bird feeder position window with tabs down to allow the seed to be reached. Fill with premium mixed bird seed. To use as a squirrel feeder position window with tabs up. Fill with corn or peanuts. to use as a nesting box remove window.