From the product description:
The downward spiral sends balls down a dizzying ride to the bottom. The hammer drop transports the balls off the track and onto 2 swiveling elevators, and the funnel drop sends balls on an express ride straight to the bottom.
Appropriate for builders of 9 years and over, Amazon claims you can still order this with their Standard Shipping to get it by December 24th.
Here's the link to the K'Nex Motorized Madness Ball Machine.