1, Siling consists of two connected firecrackers. Siling is also connected by a small iron ring. One end of the four spirits is lit, and when the flame burns to the small iron ring in the middle, it will detonate the first section of firecrackers, and the flame will continue to burn to the other end, and when the flame reaches the small iron ring of the second section of firecrackers, it will detonate the second section of firecrackers. Therefore, Siling made two unique sounds in the process of detonation, that is, the origin of the name "double-sounding gun".
2. Shuangxiangpao is a common slang in northern dialect. Shuangxiangpao is used to describe a person who speaks very loudly. A person who speaks loudly when playing Allegro or certain roles on the stage. Because the double-bang gun is a kind of gunpowder and firecrackers, gunpowder and firecrackers will make a lot of noise when they explode, which is in line with the commander's meaning.
3. Four-tone gun is a kind of firecrackers made in China, which is called "double-tone gun" because of its special sound characteristics. In traditional festivals and celebrations in China, people will use the Four Spirits. For example, Spring Festival, Lantern Festival, wedding and so on. It is regarded as a symbol of good luck and blessing.