The Smoke Puffer Controller is designed to be used with a Cruise Commander 4.1 or the new Cruise Lite kits and a Steam Railsounds Commander Sound kit. This will not work with any of the other command boards. The engine must have a "FAN DRIVEN" Smoke Unit. This will synchronize the chuffing sounds with the puffing of the smoke unit. You will have a realistic puff of smoke with each chuff sound.