A precious calligraphy was suddenly exhibited in a museum in the middle of the night, which was an urgent alarm. The police immediately rushed to the scene and caused scratches on the exhibits that the suspect attempted to steal. You may not believe it, but there was no night guard when you called the police, but the glass was scratched! This is a special kind of glass with a very fine metal mesh. Power line network automatic alarm. When the suspect knocked on the barbed wire through the glass, he remembered the police. This kind of glass is called "wire mesh anti-theft glass" and can be used in museums, banks, jewelry stores, shops and buildings.