An innovative, state-of-the-art bird feeder with a motor-driven, weight-sensitive perch that activates and rotates under a squirrel's weight. Several featherweight birds have no effect and feed peacefully, but grey squirrels are flipped off the feeder. Power stick charger included. Capacity: 5 lb. of seed. Dimensions: 29" H (including 7" hanger); tube is 4-3/4" in diameter; perch ring extends 1-3/4" from tube. Stainless steel hanger. Made by Droll Yankees with a limited lifetime warranty.