That depends on which brand you bought! You can go to Beijing to see that the security personnel of buses and subways and the staff on duty in Tiananmen Square all wear portable aerosol fire extinguishers. Small size, simple operation, high fire extinguishing efficiency, non-toxic and harmless to human body, and maintenance-free for 4 years. I am proud to tell you that there is no problem if our company's products are of this kind.