The SquirrelStop automatic spinning squirrel deterrent safely and harmlessly protects your hanging bird feeder from hungry squirrels, When a squirrel climbs onto the feeder, the increased weight starts the SquirrelStop motor, which spins the feeder and causes the squirrel to jump off, Squirrels soon learn to leave your feeder alone - and birds can enjoy their food undisturbed, Prevents squirrels from wasting birdseed, Works with any hanging feeder weighing up to 10 lbs, Requires no assembly, and is easy to use, Is safe and harmless to squirrels and birds, The weight of the squirrel on top of the feeder starts the SquirrelStop spinning for 20 seconds, which causes the squirrel to jump off, Birds, being significantly lighter than squirrels, are unable to trigger the SquirrelStop, even if several birds are on the feeder at the same time, Suitable for birdfeeders up to 10 lbs (4, 5 kgs) total weight including birdseed, Operates on three D-cell batteries, SKU: AGMD669