Product Description The Droll Yankees Flipper is an excellent choice for those seeking bird feeders for outdoors squirrel proof; it's crafted to thwart intruders with its weight-sensitive design, centered around a spinning perch. When squirrels try to enter 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. The sturdy polycarbonate feeding chamber is a whopping 4-3/4 inches in diameter and 21 inches long, giving you a break between refills. The four feeding chambers are easily accessible via the perch ring, and the interior of the chamber is designed to direct seed into the seed ports. Droll Yankees prides itself on crafting quality products in the USA, and this anti squirrel bird feeder is a testament to that legacy. Ideal as both a hanging bird feeder and a bird feeder outside hanging, it is a reliable choice for those looking to create a vibrant bird haven. Enjoy the squirrel-proof bird feeder that enhances your outdoor space while effectively keeping squirrels at bay. Amazon.com This Yankee Flipper squirrel-proof feeder is the ultimate feeder for keeping your feathered friends fed, and the furred fiends hungry. Let's talk about the basics first. The sturdy polycarbonate feeding chamber is a whopping 4-3/4 inches in diameter and 21 inches long, giving you a break between refills--and ensuring that squirrels can't hang down from the top to reach seed. The four feeding chambers are easily accessible via the perch ring, and the interior of the chamber is designed to direct seed into the seed ports. Now, for the fun stuff: The birdfeeder features an encased motor and rechargeable (and replaceable) batteries. When you receive the feeder, simply charge the batteries overnight, hang the feeder from its looped bail wire, and prepare to be amazed (and entertained!). The motor is connected to the weight activated perch ring--birds will not set it off, even larger species like woodpeckers and cardinals. But the minute a squirrel hops onto the perch, the motor is triggered and the feeder begins spinning, taking the squirrel for a whirl before it loses its grip and is thrown (gently) from the perch. It's a humanitarian way to deal with persistent squirrels--there are no shocks or poisons to hurt them, simply a wild ride that they won't be inclined to repeat. Birds are free to eat without disruption, and your family will get a kick out of watching squirrels go for their rides. There's a lifetime warranty on the feeder body and a one-year warranty on the motor and battery charger. --Ariel Meadow Stallings