Sillosocks Son Of Stalker Motion Decoy Machine simulates birds landing and looking for the X to set down and find a feeding place. Controlled with a variable speed rheostat, the realistic side to side motion along with the flapping motion of the flapper decoys has been very effective for field waterfowl hunting. The Son Of Stalker Machine operates on a 12 volt battery (NOT included). Son of Stalker weighs only 5 lbs. Decoys NOT included.