Birds love to eat from this hanging squirrel proof feeder. The weight activated motor driven feeding perch is calibrated to react to a squirrel's weight. When a squirrel hangs on the perch, a connection is made with the motor that spins the perch around and the squirrel is harmlessly flipped off. The unit comes equipped with the rechargable NiCad batteries and a charger. It can hold up to an amazing 5 lbs. of seed. Squirrels can't reach seed from hanging off the top of the feeder. This feeder has a lifetime warranty.