Generally, this is blank ammunition, that is, only sound without bullets. At present, the salute in the celebration market is mainly divided into three categories: the first category is gasoline salute, the second category is mixed gas salute, and the third category is electronic salute. The first type is the gasoline salute, which is composed of steel frame and steel plate and has technical indicators. The circuit part consists of manual control part and remote control, and a single gas path (mainly gasoline and oxygen mixed, electronic ignition sound). The second type is the mixed gas salute, which consists of steel frame and steel plate and has technical indicators. The circuit part consists of a manual control part and a remote controller, and consists of two air paths (mainly oxygen and liquefied gas are mixed, and the electronic salute sounds when knocking). The technical index of the three-type electronic salute is composed of external colloid, and the circuit part is mainly composed of independent explosion head, trigger electric shock needle and booster circuit. The high voltage discharges through the air between the electrodes, producing sparks and sounds at the same time, and producing a large number of negative ions to help purify the air.