Just set it and forget it! This timer makes any of our machines operate on an automatic mode. You can set the machine to start and run for a set time. Set up this operation in seconds. Confused about fog machines? Want to know more about how they work or the types of machines available? Heres a resource that takes the mystery out of choosing the right fog machine for your application.Special Shipping Information: This item ships separately from other items in your order. This item cannot ship to a P.O. Box. This item may be subject to additional processing days.ITEM IS NOT ELIGIBLE FOR EXPEDITED SHIPPING