Automatic gas fire extinguishing systems; Deluge alarm valve systems; Wet alarm valve systems; Foam fire extinguishing systems; Sprinkler head series; Fire pump coupling series; Fire hydrant series; Fire alarm bells, emergency lighting, and emergency indicator light series; Manual fire alarm button series; Karaoke fire audio-video alarm switchers; High-rise building life-saving descent devices; Wooden and steel fire doors, fire shutter series; Fire retardant coating series; Various portable and wheeled fire extinguishers; Suspended automatic fire extinguishing devices, etc.