Avian X Power Shaker Mallard Drake Surface Feeder Motion Decoy Foam filled decoy Patent Pending design Shaker module Authentic preening motion fools the wariest of fowl Creates wake in spread that ultimately makes adjacent decoys move as well Power Shaker will save the hunt on no wind days Makes your entire decoy spread come alive Powered with (4) AA batteries (not included) for up to 10 hours run time