Making self-defense devices privately has many risks and may violate laws and regulations, so it is not recommended. At the same time, using violence to solve problems often leads to more serious consequences and may cause oneself to fall into unnecessary trouble and danger. When facing danger, it is more recommended to protect oneself in a legal, reasonable and safe way, such as seeking reliable assistance in a timely manner (such as calling the police), learning effective self-protection skills (such as self-defense, escape techniques, etc.), and avoiding dangerous environments as much as possible. It is more appropriate to maintain social order and security through legal means and public security systems.