Truly squirrel proof feeder. The entire feeder is weight sensitive, though all the perches are located at the bottom. When the squirrel lands on the feeder, the outer metal shroud drops to cover the feeding ports. Just be sure to place your Squirrel Buster where there are no surrounding branches or perches the squirrels can reach across from. The Legacy's weight sensitivity is adjustable to best meet your needs. Holds roughly 2.6lbs. of seed.