The price of natural gas leakage alarm is about one or two hundred yuan, and the expensive one is one or two thousand yuan. The price of natural gas leak alarm is influenced by brand, category, specification, market and so on. Forcibly installing an alarm is illegal and may constitute a crime of forced trading.
Legal basis:
Article 226 of the Criminal Law of People's Republic of China (PRC) refers to the crime of forcing others to provide services or accept services by means of violence or threats, and the circumstances are serious.