Check the listing for details. AUVI PRO Cold Spark Effect Machine Controller. Condition: New. Listed at 59.99 USD. Fireworks displays are an incredible way to entertain people. There are plenty of fireworks available on the marketplace, though they don't always allow you to create the show that you desire. With the Sparki Cold Spark (simulated sparkler fountain) machine from AUVI PROD, you can create spectacular indoor displays for such events as.