No gunpowder in it, so it does not produce flame while it works.
Working power supplied: The voltage of the firing system should not be lower than 12V. But if you use with the single cue firing system from my store, the battery must be 6LR61/9V alkaline battery or other better quality 9V battery..
They are special for the slow lead wire, be used for igniting professional fireworks and used in fireworks display.
These are 1 time use only and are not reusable.
Please follow the instructions(Just in English) to use the safety igniter.