A 12 volt device, that when used in conjunction with your flyer type decoys such as the Flapping Flyers below from SILOSOCK DECOYS, makes the decoy move side to side in an erratic movement offering excellent movement to any spread. This decoy movement simulates Geese diving into the Flock. Rheostat speed control included. More than one can be run on a small automotive battery. Comes with 20 feet of cord. Multiples can be set forty feet apart with a battery source located in the center.