The patented Squirrel Buster technology is truly squirrel proof, thousands of delighted bird lovers have confirmed it. Openings in the wire shroud align with the seed ports and provide birds access to the seed. When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing access to the ports. The seed ports have perches for perching birds and the wire shroud provides a place for clinging birds. It must be hung, this feeder dismantles easily for cleaning and is factory warranteed. It can hold up to 1.4 quarts of various seed.