The MOJO®Rippler will make ripples and waves thru out your spread giving motion to otherwise dead decoys. Duck hunters must have dependability and reliability and this decoy is designed to meet the rigors of this type of hunting. All moving parts plus batteries are contained in an easily removable housing of a screw lock design. The easiest and most economical motion device you can add to your spread. Operates on 4AA batteries (not included).