Equipped with patented Squirrel Buster technology, this Brome 1057 Squirrel Buster Standard bird feeder offers an innovative design that attracts birds while keeping squirrels at bay. The bird feeder holds up to 3/4 quarts of birdseed, whether it's Black Oil sunflower seed (good all-round birdseed) or other seed blends specific to your area. Attracts All Kinds of Birds A welcome choice for bird lovers, the squirrel-proof bird feeder attracts a wide variety of clinging and perching birds including American Gold Finches, Chickadees, Hairy Woodpeckers, Cardinals, Indigo Buntings, Rose-Breasted Grosbeaks, White-Breasted Nuthatches, and Purple Finches. Seed Saver Technology Openings in the bottom section of the metal mesh shroud align with the seed tray, providing birds access to the food. When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing access to the seed. Squirrels and some large birds are blocked from accessing the seed but are not harmed in any way. Negative Grip Tube Even more, the feeder includes a negative grip tube, which prevents squirrels from grabbing the wire hanger with their hind legs, hanging down alongside the feeder, and defeating the closing mechanism. Seed Ventilation System Traditional transparent seed tube designs trap solar energy and block the escape of hot, moist air. The seed ventilation system lets hot and humid air escape through vents at the top of the feeder as fresh air enters the seed ports and openings on the bottom of the seed tube. Birdseed remains fresher and attracts more birds. The Lasting Beauty of RoxResin Components Remarkable RoxResin is waterproof, rustproof, dishwasher-safe, and UV stabilized. Because the color is blended into the material itself, RoxResin components show little sign of wear and tear, even after prolonged and repeated exposure to the elements or marauding squirrels. Place the Feeder Almost Anywhere Place your feeder just about anywhere--no more worrying about those pesky squirrels. Position the feeder by your deck, in a nearby tree, or over a favorite window for those great close-up views. The bird feeder hangs easily with the use of wall brackets, branch hooks, or extension hooks. Be sure to allow for at least 16 inches (40 cm) of clearance around the feeder. This clearance will prevent a squirrel from reaching over from a nearby foothold to access the seed without placing its weight on the feeder. Forcing the squirrel to climb all the way onto the feeder triggers the closing mechanism, preventing access.