Droll Yankees® Yankee Flipper® Squirrel-Proof Bird Feeder, 5 lb. capacityThe Yankee Flipper Squirrel Proof Bird Feeder is a motor driven, weight activated squirrel proof feeder. It allows birds to eat and saves seed by keeping squirrels away. Motor driven, weight activated perch ring allows songbirds to eat, but gently spins squirrels off the perchHeavy metal cap fits snugly on the tube to prevent squirrels from lifting it to reach the seedLength and width of tube are designed to prevent squirrels from reaching the