Bird Quest SBF6TAS1 18" Super Twirl Spiral and Twirl a Squirrel Patented spiral perch attracts more birds and allows more birds to feed Twirl-a-Squirrel feature is safe - does not harm birds or squirrels Squirrel's weight on feeder activates a motor which gently twirls him off! No need to purchase "special batteries" - operates on three standard "D" size batteries (batteries not included) Bottom comes completely off for an easy clean