A firecracker is a pyrotechnic product used to create a sound effect and may have an accompanying light or whistle effect. The main purpose of firecrackers is to generate a loud sound effect, which is measured in decibels at a certain distance from the firecracker. Firecrackers are made in various shapes and sizes and may have various additional effects, such as a flash of light or a whistle, etc. Firecrackers in the F3 category are freely sold in the Czech Republic to persons over 21 years old, and there is no need to be a professional pyrotechnician to use them. These firecrackers are classified as low-risk explosives and can only be used in accordance with the applicable regulations. It is necessary to strictly follow the usage instructions and all safety measures to minimize risks when handling firecrackers.