The Droll Yankees Yankee Flipper Squirrel-Proof Bird Feeder combines superior durability and a weight-activated, motorized perch to provide humane squirrel defense. The UV-resistant seed reservoir and powder-coated, heavy-duty metal components offer superior durability and resistance to the elements and squirrel damage, so you can be sure this feeder will last through many seasons. When a squirrel tries to gain access to the feeder, the weight-sensitive perch activates the motor. The spinning action then gently tosses the squirrel off before it can devour your seed supply. In addition, the tight-fitting metal cap prevents squirrels from lifting the lid, while the long seed reservoir prevents them from reaching the ports from above.