This machine is non-flammable and safe for use indoors and outdoors. It operates continuously for 10 minutes in 90-second intervals, followed by a 20-minute cooling period before it can be reused. A 200g powder pack accompanies e and is available for rent as an individual unit. A cold spark machine is a special effects device that produces safe and visually striking sparks without traditional pyrotechnics. It uses non-combustible metallic granules, typically titanium or zirconium, heated and propelled into the air to create a calm, bright spark display.