It is a heng long. The manual says the smoke switch is on the side, there is a hole for a switch but no switch. Next to the main power switch, there is another hole for a switch but again, no switch. I mean it has a smoke generator, I can see it and it is hooked up to the main board. There is a switch on the controller for smoke, but as far as I can tell no switch on the tank despite what the manual says.