Our bouncer simulates waterfowl leapfrogging in a field Active birds are always jumping up to get of the front of the pack. The bouncer has 2 arms and a manual control to set the speed. It can be used with any of our mallard snow/blue or Canada flappers in addition to all the wingbeat species we make. Very economical way to add realistic motion to your spread. Winds of 5 mph or above with make the wings flap It runs on any 12 volt battery not included. Please note flappers/wingbeats are not included.