certified fire detector OEM fire equipment CE approved fire safety China fire safety manufacturer EN54 certified fire safety deployment IoT fire monitoring fire alarm system contract fire safety product manufacturing commercial fire safety wireless fire detection fire safety case study fire protection solution source factory fire equipment smart fire platform industrial fire protection Wanlin Fire Control fire safety R&D global fire safety partner fire safety exporter buildin Conventional smoke heat composite sensor fire safety smoke detection fire alarm fire protection smoke alarm fire detector fire sensor photoelectric detector CE approved fire safety equipment addressable detector conventional detector wireless smoke alarm battery smoke detector hardwired detector OEM smoke detector wholesale fire alarm fire detection system smart fire alarm IoT fire safety commercial fire protection industrial smoke detec gas leak detector door window sensor PIR motion detector home fire safety 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