The ultimate squirrel-proof feeder! Birds will love to eat from it, but squirrels are prevented by a weight activated perch. When a squirrel steps on the perch, a connection is made with a motor that makes the perch spin and the squirrel is flipped off the feeder, unharmed, onto the ground. The feeder holds four quarts of sunflower or mixed seed, has four feeding ports and measures 21"L x 4-3/4"Diam. It comes with a charger and rechargeable NiCad batteries. The stainless steel wire for hanging will not rust. Lifetime LMW.